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Pelican Technical Article:

Oxygen Sensor
Replacement

Difficulty Level: 2
Difficulty scale: Adding air to your tires is level one
Rebuilding a BMW Motor is level ten

     This article is one in a series that have been released in conjunction with Wayne's new book, 101 Performance Projects for Your BMW 3 Series. The book contains 272 pages of full color projects detailing everything from performance mods to timing the camshafts. With more than 650+ full-color glossy photos accompanying extensive step-by-step procedures, this book is required reading in any 3 Series owner's collection. The book was released in August 2006, and is available for ordering now. See The Official Book Website for more details.
 
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     The oxygen sensor is one of the most important elements of the modern fuel injection systems. A finely tuned fuel injection system with an oxygen sensor can maintain an air/fuel ratio within a close tolerance of .02 percent. Keeping the engine at the stoichiometric level (14.6:1 air/fuel ratio) helps the engine generate the most power with the least amount of emissions.

     The oxygen sensor is located in the exhaust system of the engine, and senses the oxygen content of the exhaust gases. The amount of oxygen in the exhaust varies according to the air/fuel ratio of the fuel injection system. The oxygen sensor produces a small voltage signal that is interpreted by the electronic control unit (ECU) of the fuel injection system. The ECU makes constant adjustments in fuel delivery according to the signal generated by the oxygen sensor in order to maintain the optimum air/fuel ratio.

     There are a few signs that your oxygen sensor may be failing. In general, it is difficult to diagnose problems with the sensor, unless all of the other components in the fuel injection system have been checked and determined to be operating correctly. Some of the symptoms of a failed oxygen sensor system are:

  • Irregular idle during warm-up
  • Irregular idle with warm engine
  • Engine will not accelerate and backfires
  • Poor engine performance
  • Fuel consumption is high
  • Driving performance is weak
  • CO concentration at idle is too high or too low
  • Check Engine light is illuminated

     In general, if the oxygen sensor is not working, the car will be running very poorly, and will also be outputting a lot of harmful emissions. On most BMWs, the engine's computer will give you a warning signal that lights up the Check Engine Lamp if the signal received by the computer is out of it's normal range.  For more info on reading these fuel injection codes, see the the Pelican Technical Article: Reading Fuel Injection Fault Codes.

     If you disconnect the oxygen sensor and ground it to the chassis, the ECU will think that the car is running really lean, and will try to richen the mixture. At the other extreme, if you disconnect the oxygen sensor, and replace it with a small AA battery that supplies 1.5 volts, the ECU will think that the car is running really rich and attempt to adjust the mixture to be leaner.

     Needless to say, troubleshooting the complete fuel injection system is beyond this article's scope. If you think that the oxygen sensor may be causing some of your fuel injection problems, it should be replaced. In general, I recommend that you do this every 30,000 miles. The oxygen sensor is located on exhaust manifold and/or exhaust pipes that lead to the muffler.  It's location changed and varied from year to year, but for the most part, it is easy to reach and remove.  Figure 1 shows an O2 sensor from and E36 3-Series BMW.  You will typically have to jack up the car to gain access to the sensor.  See the Pelican Technical Article: Jacking Up for more details.

    Using an 22mm wrench, simply remove the sensor from the exhaust pipe.  On the E36 318, the sensor is located in a very difficult to reach spot - you may have to use a special deep socket with a slit cut in the side to remove it (Figure 2).  Figure 3 shows the electrical plug for the O2 sensor - simply rotate the plastic retainer counter-clockwise and the plug should come right off.  New O2 sensors should have the same exact plug - ready to attach to your car.  On the E36 3-Series, the plug is located towards the right side of the rear of the transmission.  Figure 4 shows the plug being removed.

   When you remove the O2 sensor, you will probably find it to be black with soot, as shown in Figure 5.  This is normal for an old, worn out O2 sensor.  Figure 6 shows the mounting "bung" for the O2 sensor.  Install the sensor into the hole, making sure that it is snug tight.  If you have the proper slit-tool and a handy torque-wrench, then tighten it to 40 ft-lbs (55 N-m).  It's also a smart idea to add some anti-seize compound to the threads of the plug before you install it.  Check the sensor first though, as new ones sometimes come with anti-seize already on the threads.

    I have found that often the new O2 sensors come with the correct plug, but the cable is way too long.  If this is the case, then secure and tie off the cable, as is shown in Figure 7.  Make sure that the cable is not located anywhere near any exhaust components - you don't want the heat melting the cable to the O2 sensor.

     Well, there you have it - it's really not too difficult at all.  If you would like to see more technical articles like this one, please continue to support Pelican Parts with all your parts needs.  If you like what you see here, then please visit our online BMW catalog and help support the collection and creating of new and informative technical articles like this one.  Your continued support directly affects the expansion and existence of this site and technical articles like this one.  As always, if you have any questions or comments about this helpful article, please drop us a line.

   
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Comments and Suggestions:
isaac Comments: Hi I have a 98 318i it wont rev over 3000rpm and drives like crap. Its showing code141 I have taken out both o2 sensors and tested them and theyr fine so I looked further into it and found that theres no power coming from the loom to the sensors with the ignition on iv checked all the fuses I can find with non blown could it be a relay? any advice on what to do now?
October 20, 2014
  Followup from the Pelican Staff: I would perform a fuel delivery system test. Check fuel pressure, volume and quality. Then check exhaust backpressure.
- Nick at Pelican Parts
 
Baba Comments: Can a faulty air sensor valve in a BMW 3 series cause a car to go to a limp mode?.
October 14, 2014
  Followup from the Pelican Staff: Trans limp? Not likely. First check the transmission fluid level to be sure it is correct. Then check the transmission ECM for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
don Comments: hi i have recent the problem withbmw320d 2004 when u strat car sounds ok then try to drive car misfire brake stearing then car beeps like some worning and in same second with this beep signal car runns fine..?
October 3, 2014
  Followup from the Pelican Staff: Is the check engine light ON? I would start by checking the vehicle for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
Mitch Comments: !Update on the o2 monitor stating Not Ready for
About 2 years. Nick you recommend me to start
Off replacing the Termostat to see if it was causing
The car not to warm up properly and o2 not changing
To ready,,,Guess what after replacing the Termostat
The 02 changed to ready :, thanks !! Now I
Only have one monitor that is stating not Ready and it's
The CAT so far I drove 74 miles and it hasent
Changed to ready yet, any advice. It's a 2004
E60 m54.
September 21, 2014
  Followup from the Pelican Staff: Great news!

Is there a misfire? If so, it will prevent the cat monitor from running. - Nick at Pelican Parts
 
Mitch Comments: Nick

Question on Replacing the thermostat on my 2004 525i m54, do I need to remove the Electric Fan to remove and replace the Thermostat? My car has the Electric Fan not the Clutch Fan. Also do you happen to know whats the torque specification when placing the new thermostat assembly?

Thanks
Mitch
September 16, 2014
  Followup from the Pelican Staff: See this tech article:

http://www.pelicanparts.com/BMW/techarticles/BMW-5-Series-E39/54-WATER-Thermostat_Removal/54-WATER-Thermostat_Removal.htm - Nick at Pelican Parts
 
Bruce Comments: I have a 2001 325i, after failed emission/check engine light, had the thermostat, secondary air injector valve, & an O2 sensor. Check engine light is off and the shop told me to run it a hundred miles before retesting, unfortunately, I have run it 200 plus miles, checked twice and monitors all three have not reset. Mechanic is scratching his head - said something about faulty memory. I am at my wits end and need to get this through emissions and back on the road. What could be the problem with the monitors? Have driven in all different conditions, including cold starts and on 3/4 take of gas.
September 15, 2014
  Followup from the Pelican Staff: Is the vehicle taking a long time to warm up? If so, the monitors will not run. If it is, there may be a misfire or fuel trim issue stopping them from running. - Nick at Pelican Parts  
daniel44 Comments: I have a check engine light on and replaced both front 02 sensors and the light is still on. My mechanic tells me that I have a shorted wire on the Engine harness for O2 sensor , which is actually the wire that runs from the engine to the back and connects to the O2 sensor by the catalytic. I've been looking foer that part and have not been able to find it at the dealer or junk yard. can you advice as to what I need to do to get this problem fixed.
thanks
September 8, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 
Mitch Comments: Thanks Nick
September 6, 2014
  Followup from the Pelican Staff: No problem. - Nick at Pelican Parts  
Mitch Comments: Thanks for your reply back.
Correct meant the o2 Reading Not Ready.

But the other Monitors do Read Ready.
The car is a 04 525i and it done take about
15-20 Min to warm up and acuple of years back
A friend of mines put the computer on it and told me
That the thermometer was going to need to
Be replaced, but I never did it. Should I start
Here as in replacing it to see if at some point
The o2 will change to Ready? Thanks
September 6, 2014
  Followup from the Pelican Staff: Try the thermostat first. Replace it, get the engine to warm up correctly. That may solve it.- Nick at Pelican Parts  
Mitch Comments: Need Help on the Co2 Issue on my car it has been about 2 to 3 years that my Co2 states NOT READY but it Passes State Inspection. No Engine Light and No Fault Code. It's a 2004 525i and I would like to resolve the Issue.
I just don't know if to replace all 4 Co2 when the issue could just be one or if a Co2 is Disconnected, don't know were to start trouble shooting it. HELP Thanks
September 3, 2014
  Followup from the Pelican Staff: I think you mean O2 sensors are not ready. This could be an issue with the engine warming up too slowly or a bad DME. - Nick at Pelican Parts  
Rachel Comments: Hello. I have a 2000 323i. I was getting the code for all four of my o2 sensors, and both cam shaft sensors. I replaced all of the o2 sensors along with the intake cam shaft sensor. The top 2 o2 sensors are still showing a code. Could that be because I have not replaced the exhaust cam shaft sensor yet? Would that affect how the o2 sensors read?
August 28, 2014
  Followup from the Pelican Staff: Is the code for the circuit or the signal function? The camshaft sensor should not cause o2 faults. - Nick at Pelican Parts  
am1994 Comments: Hello, I have an e36 318is with a M44B19 block. I just recently replaced the two o rings inside the oil filter housing since it leaked. I've also replaced the disa valve, idle control valve, spark plugs and cleaned the fuel injectors. However, it still had a rough idle when stationary. It would sit around 600rpm and runs rich in emissions.

I would assume it could be a faulty thermostat since my temp gauge sometimes won't sit on the middle. Had the o2 sensors cleaned but it maybe faulty as well.

Any suggestions?
August 8, 2014
  Followup from the Pelican Staff: Is the check engine light on? Sounds like an engine misfire. I would check spark, fuel and compression on all cylinders.
- Nick at Pelican Parts
 
Carlucci Comments: Hi I have a 1996 318 ic 1.9L I believe it use 2 oxygen sensors if my car use 2 are they the same or not?


Thnx att Carlucci
July 27, 2014
  Followup from the Pelican Staff: No, they will be different part numbers, likely due to wire length. - Nick at Pelican Parts  
Anna Comments: Hi- went to have the inspection done on my 2003 Z4 that has 36,500 milesand failed. Emissions test results indicate both the O2 sensor status and the Catalyst as not ready. I've had the car for about a year and have put 350 miles on it, no work done since right before I bought it when the battery was replaced. Is this a reset issue or does something need to be replaced? Thanks!
July 7, 2014
  Followup from the Pelican Staff: Try driving it for a town, then highway trip. The monitors should set. If they don't, there may be an issue about to set a fault code. - Nick at Pelican Parts  
Suso35 Comments: Thanks for your reply.

Went to workshop and did the diagnose and it appears O2 SENSOR FAULT CURRENTLY PRESENT.

I bought the BOSCH 4 wire o2 sensor and now the foreman said the wire length is different with the currently plugged on my car. Will the wire length be a problem here?

Car is 94 325 model and only has 1 o2 sensor. Is this correct?
On the wire's length, can I just plug it in without doing any alteration on the length?

Thanks in advance.
July 6, 2014
  Followup from the Pelican Staff: If it is a little longer, it should be OK. Just be sure the wiring is routed safely. - Nick at Pelican Parts  
thiers Comments: Maybe its been answered but I have a 95 325 how many oxygen sensors do I have? I have heard everything from 1 to 4. And can you post a link to the sensor you would suggest I use?
July 6, 2014
  Followup from the Pelican Staff: I believe you have 2, one pre and one post. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
Suso35 Comments: Update to last post.

I've read somewhere maybe here car can lose power caused by :

1. Failing MAF
2. Failing O2 sensor
3. Injector problem
4. Misfire wiring
5. Clogged catalytic box

Sometimes, my car will lose power after the engine get warm. While its in the cool state, the engine will run smoothly.

Are all points I stated up there can be real for the problem i had?

Problems are :

1. High fuel consumption.
2. Lose power after engine runs at least half an hour.
3. Somemore but cant remember.
June 29, 2014
  Followup from the Pelican Staff: Could be a fuel pump issue or misfire. I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.




I would also perform a fuel delivery system test. Check fuel pressure, volume and quality. - Nick at Pelican Parts
 
Suso35 Comments: Thanks for your fast reply.

If the o2 sensor will only cause a little difference in fuel comsumption, what is the possible problem for my high fuel consumption?

Also, do i need to reset the car after change the o2 sensor or anything? How to reset it?

Thanks.
June 29, 2014
  Followup from the Pelican Staff: High fuel consumption could be too high of fuel pressure, a misfire or a leaking fuel injector. - Nick at Pelican Parts  
Hasselhof Comments: My BMW Z3 1.9L m44 engine vibrates a lot when idle, I believe some people call this a rough idle.

$8 diagnostic tool reports a faulty O2 sensor #1. Can this be the cause of vibration?

Some videos of the car:

https://www.youtube.com/watch?v=qxrFUz3QpgQ

https://www.youtube.com/watch?v=dyZP_p-FfVk

https://www.youtube.com/watch?v=hkNIujtIisk
June 28, 2014
  Followup from the Pelican Staff: o2 sensor won't cause a rough idle or misfire. Is the check engine light on? Sounds like an engine misfire. I would check spark, fuel and compression on all cylinders. - Nick at Pelican Parts  
suso35 Comments: Hi Pelican,

car is E36 325

My fuel consumption is at 19l/100km. And lately, my FC is about 5 liters only 10km ONLY. i had dignosed the car yesterday and it shows my o2 sensor is failing. Can this be the reason on why my FC is that high?

Also, can the FC problem solved once I replace the O2 sensor?

Thanks.
June 27, 2014
  Followup from the Pelican Staff: Is FC - fuel consumption?

The o2 could lower fuel mileage, but not a great amount. - Nick at Pelican Parts
 
BBM Comments: 2001 BMW 530i Just had a reconditioned engine with most of the parts not changed for e.g.Oxygen Sensors,Camshaft Sensors etc,etc..I just replaced both of those parts but the car still isn't shifting in the way it should.Though the car is performing a little better the engine does sound heavy when I put the foot down so can you advise me as o what other parts may need to be replaced??
June 25, 2014
  Followup from the Pelican Staff:

I would start by checking the vehicle for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.


I would perform a fuel delivery system test. Check fuel pressure, volume and quality. Also, check backpressure. - Nick at Pelican Parts
 
BMW-only Las Vegas Comments: Update to last message. Mileage on the car is 150K, have no idea when was the last time replaced those two oxygen sensors, probably never.
June 22, 2014
  Followup from the Pelican Staff: Ok, got it. - Nick at Pelican Parts  
BMW-only Las Vegas Comments: Hi to everybody, I have a good question about my 1999 M3 US version, the problem is that the car runs like 325i, no power, checked for the fuel pressure 3.03bar instead of 3.5bar, when give it gas after 3000rpm the pressure increase up to 3.4bar, release accelerator and drop to 3.03bar, replaced fuel filter, fuel pressure regulator and fuel pump and vacuum lines related to fuel pressure regulator, everything OEM, still the same results, checked for power on fuel pump, the same like on the battery 14 , 14.5 volts,
Besides that was replaced oxygen sensors bank 1,2 sensors 1 only.
Gas mileage is 16, 17 mpg city and 23mpg hwy, I consider that's little bit to much for M3 manual transmission.
Do you think that should I replace the other two oxygen sensors, post cat ?! Can they make this problem ?
June 22, 2014
  Followup from the Pelican Staff: Post-catalyst oxygen sensors will not create a low power issue. Have to checked exhaust backpressure? - Nick at Pelican Parts  
first bme Comments: searching net on problem, and thread about egr cooling thermostat leak causing white smoke first start in morning. this should surely cause a drop in coolant level over time ?
June 7, 2014
  Followup from the Pelican Staff: Th white smoke during start only cold is likely condensation in the exhaust, which is normal. - Nick at Pelican Parts  
first bmw Comments: no loss of coolant over last 3 weeks, no evidence of water in oil
June 6, 2014
  Followup from the Pelican Staff: OK, thanks. - Nick at Pelican Parts  
first bmw Comments: 2006 320d tourer,on first start up in morning engine kicks out white smoke for a couple of seconds and runs a little rough, I changed glow plugs and engine noe rums smoothly on start but still whith smoke for a couple of seconds. no visable smoke for rest of day
June 5, 2014
  Followup from the Pelican Staff: Is the cooling system low? White smoke is likely coolant. I would pressure test the cooling system. If the system will not hold pressure and there are no external leaks the head gasket may be faulty.
- Nick at Pelican Parts
 
R.Nevaless Comments: Hello, I have a 1993 320i and my fuel consumption is really bad, I have filled the gas tank to full with premium fuel and all I have driven it is 4 kilometers 2.4 Miles and I am almost at 3 quarters of a tank left, what could be causing this? I have already replaced the Fuel Pump, Fuel Filter, Spark plugs although when replacing them I noticed a rust coloured sort of build up on one of the ignition coilscrankshaft position sensor, and my mass airflow sensor and my car does not start up easily, I am also aware that my valve cover gasket needs to be replaced because I can smell the oil burning, could a bad O2 sensor be the cause of the bad fuel consumption thanks.
June 2, 2014
  Followup from the Pelican Staff: This could be a fuel leak or an engine misfire. If the engine is running poorly, check each cylinder for a misfire. If you locate a misfire, check for spark, fuel injector pulse and compression on the bad cylinder and a few good ones. - Nick at Pelican Parts  
BIRDIEMAN Comments: hi i have a 2004 645ci 135,00 miles i would like to know if i should change all the oxy sensors and how many are on my vehicle looks like big $S
May 22, 2014
  Followup from the Pelican Staff: There are four sensors. Give our parts specialists a call at 1-888-280-7799. They can help you find the right parts.
- Nick at Pelican Parts
 
MrKoobz Comments: Nick- Firstly, thanks for all your patience and help on Pelican Parts. I've used many of your articles and saved $$$ on maintenance service for my 95 318ti.

I'm not too sure if this is the appropriate place to ask this question, but here it goes.

Anytime that it rains light or heavy or when I wash my engine bay, or if there is moisture on the ground in form of puddles or just splash back from drivers ahead of me, the car goes into "handicap mode".

There is virtually no throttle response in the lower rpms. I have to pump the gas pedal in order for it to rev up so I look like an incompetent fool trying to start from 1st gear at a stop light.

If I am able to maintain rpm above 4500, everything works fine. Once the RPMs drop below 4500, I continually need to pump the pedal in order to get an ignition response.

Only code the DME throws is an oxygen sensor. Do you think a faulty Oxygen Sensor is to blame for such sporadic behavior?

Penny for your thoughts.
May 7, 2014
  Followup from the Pelican Staff: Not likely that the O2 sensor would cause such a hesitation. I would start by checking for water intrusion, if that is the indicator of when the problem occurs. Check the E-box for water, if the DME is getting wet, it could cause your issue. - Nick at Pelican Parts  
Anthony Comments: When i unscrew maf sensor a little it works out air flow and it runs just fine but if i have it screwed all way down like it suppose to be maf sensor it jumps up and down and doesnt run to great,,,,
May 6, 2014
  Followup from the Pelican Staff: I'm still not sure what you are unscrewing. The electrical connector or are you pulling the sensor out of the duct?

This is not a test that means anything to me. So the result is null. IF you are having an idle issue, look for broken intake air boots, vacuum leaks and fuel delivery issues. I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
Anthony Comments: hello i have 1995 bmw 325i e36 i replaced maf sensor my rpms still is jumping when it twisted all way down,

If i unscrew it a little it will run just fine... any ideas
May 6, 2014
  Followup from the Pelican Staff: When you unscrew what? - Nick at Pelican Parts  
dalydollars Comments: Hi, I have a 03 bmw 318ci. I have car revving problems in idle, EML on and losing power in lower gears. Got it checked at garage and told me a 02 sensor needed replacing. 2 weeks later EML back on and no improvement still the same problems. I had a few different people look at it and cannot figure it out. Also ABS lights coming on intermittely at various speeds with a scrathing noise underneath the front of the car. Any ideas??
April 28, 2014
  Followup from the Pelican Staff: Could be a faulty throttle control module. I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
Karl Comments: Hi, I have a 325i E36 1992 European version. A couple of months ago it started to develop a rare stalling situation where the car on rapidly release of the accelerator or hard braking could shut down if you didn't pump the pedal and try to recover it this happened occasionally. Usually when the engine is warm and the car is parked with the A/C off, it idles rough. I've already changed spark plugs and cleaned the injectors.
Recently, the car alternator started to fail radio turned off and dashboard lights started to turn on and off specially ABS and battery light came on. The car shut down while I was on traffic but I was able to start it again. The next morning it wouldn't start. I wanted to know if the previous stalling situation could have been produced by a poor alternator that was starting to fail, or should I be looking for something else. Also, the computer showed that two of the ignition coils failed, but on a manual test there was no sign of a failing coil and after resetting the computer, the codes didn't come up again.
Thanks in advance!
April 24, 2014
  Followup from the Pelican Staff: Sure, if voltage drops, lets say along with RPM, the engine will stall. - Nick at Pelican Parts  
ChauN Comments: Please help me to udnerstand more about "pending code"? Right now, garage ppl checked and there is no code. Just only shows two items "NOT READY" and they asked to keep driving. Do you know anything about "driving cycle"?
Regards,
April 21, 2014
  Followup from the Pelican Staff: A drive cycle is what a specific vehicle requires to run emission monitors. Each vehicle can vary.

A pending code is a test that failed, yet not enough to set a light.

- Nick at Pelican Parts
 
ChauN Comments: How long should I drive to reset the emmision monitors. I drove around 200 miles already. Do I need to follow "driving cycle"? Garage ppl check three times already and NO CODES; only "NOT READY" for both O2 sensor and Evaporative System. Thanks again
April 20, 2014
  Followup from the Pelican Staff: If it hasn't reset in 200 miles there may be a pending code, blocking the process. I would check for pending fault codes. - Nick at Pelican Parts  
ChauN Comments: I have "Engine Service Soon" Light ON. Fixed it by replaced the "intake manfold actuator"; LED off and no more codes but "Oxygen Sensor" and "Evaporative System" are bth not READY. Garage ppl told me to keep driving so car will learn. What should I do? keep driving or fix O2 sensor? Thanks so much
April 19, 2014
  Followup from the Pelican Staff: The vehicle has to be driven to reset the emission monitors. if a sensor is faulty, the monitor will fail and a after the second failure a fault code will be stored. - Nick at Pelican Parts  
markovnik222 Comments: hi. i have a problem with my MAF sensor. when MAF sensor is connected i start a car he's cut off. when i disconnect a plug from MAF sensor car starts good. i had changed to a new MAF sensor, still the same. i tried to blow into MAF sensor when he's connected engine starts cut off. i think maybe when i replaced a new MAF sensor i need reset ecu. any ideas what i need tyo do? thanks
April 18, 2014
  Followup from the Pelican Staff: Have you checked for fault codes? I would assume the MAF is not your issue. You may have a vacuum leak or fuel delivery issue. - Nick at Pelican Parts  
Otto Comments: Hello. Just had to replace a faulty injector on my 325i but the engine is still rough on idle before evening out. The mechanic mentioned that the oxygen sensor was probably contaminated - will this wear off or I will I need to clean or replace the sensor now ? Thanks
April 7, 2014
  Followup from the Pelican Staff: O2 should not cause rough running on one cylinder. I would check for a misfire on that cylinder, spark, fuel, compression. - Nick at Pelican Parts  
Hubba Bubba Comments: I just bought a 1998 BMW 318ti that was running rough no power, backfires, etc. I replaced the belts, spark plugs gapped at .035 and than gounded to the engine block and tested. I witnessed and good spark on all 4, spray nozzles, air filter, oil & oil filter, fuel filter and radiator. Now it won't start and backfires when attempting to start. Since I've confirmed all 4 cylinders are receiving fuel, spark and air, I am assuming the problem is being caused by a bad sensor and or a bad ECM?
March 31, 2014
  Followup from the Pelican Staff: If you have all items needed to start, it should. have you checked compression? It's possible engine timing is off. - Nick at Pelican Parts  
franny Comments: hi ive got 318i 03 touring it was idiling up and down when i came to trffic lights so put fault code reader on when i got home came up with one fault code po116 engine coolent temperture any idia what could be causing it
March 29, 2014
  Followup from the Pelican Staff: Could be a faulty coolant temp sensor or thermostat. I would start there. - Nick at Pelican Parts  
jose Comments: So my 2004 ci bmw service engne lights pops ouy and they. told me it the o2 sensor how i find out which one is it since there are to o2 sensors
March 26, 2014
  Followup from the Pelican Staff: The fault code will note which sensor it is. - Nick at Pelican Parts  
Faisal Comments: hi there i have BMW 320i E36 1994 i am facing a problem with the engine of my car that it cannot with stand the RPM below 1k it shuts down by it self on low idle even while driving it is same please suggest what to do I shall be very thankful to you.
March 22, 2014
  Followup from the Pelican Staff: Could be a faulty fuel pump or ignition system. - Nick at Pelican Parts  
anna Comments: 06 bmw m3 did not pass inspection: catalyst not ready/
o2 sensor not ready, the inspection place advised me to drive it for a while. so light will go out. car was off the battery for the winter, could this be the reason?
March 5, 2014
  Followup from the Pelican Staff: Yes, i the battery is disconnected the emission monitors with reset. Drive the vehicle for a day then return for an inspection. - Nick at Pelican Parts  
DoubleR Comments: Hi guys! I have a 2006 323i. If I keep the RPMs above 1k the car runs fine. But if the car's RPMs fall below 1k the engine light comes on and it retards the engine so it can only be limped along. Pulling over and shutting the car completely off resets the degraded engine light and it will stay off until the RPMs fall below 1k again. I recent had the plugs done in the car to fix a stutter when accelerating and roughly a month later it started doing this. Any thoughts on whats wrong or where to start? I should also mention the weather here when it started doing this is -25 to -30 celcius.the car is warmed up by being held at an idle slightly above 1k.
March 3, 2014
  Followup from the Pelican Staff: COuld be a vacuum leak or an engine misfire. I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
: Comments: I just rebuilt my vanos and replaced my valve cover. 99 323i

Now I have an exterme buzz coming frommy ccv. When I pull the vapor return hose from the front of the VC and cover it with my thumb the noise completely stops. When I turn the car off it makes a Chewbacca noise.

I am wondering if the o2 sensors on my exhaust heads will trigger the ccv??

Just wondering because the wires to this o2 sensors were the only other thing I touched.

Thanks
February 26, 2014
  Followup from the Pelican Staff: If the breather valve is making noise it is likely faulty. I would check crankcase vacuum and replace the valve if it is out f spec. - Nick at Pelican Parts  
Dan Comments: Hello I have a 96 328is and I'm pulling a p1189 and p0430 code. Could this be two faulty o2 sensors since the the one pre cat is coming up? Thanks.
February 24, 2014
  Followup from the Pelican Staff: I would repair the o2 sensor fault code. Then see if the catalyst efficiency fault code returns. Two bad o2s at the same is unlikely, unless of course they are damaged from contamination or impact. - Nick at Pelican Parts  
Andrew Comments: Hi, i am driving a bmw 330i 2011 and the car runs fine but sometimes when i press the throttle to go fast a little bit the car shakes a bit but mot hard as if someone pushed the car it happens from time to time and also happens sometimes when i take my foot off the gas instantly, what could this be. And i have another questions, bmw here in egypt told me you dont change the transmition oil ever unless u have a problem with my transmission and the car is 85,000 km so far is that true or not. Thank you in advance for your help i really appreciate it.
February 8, 2014
  Followup from the Pelican Staff: You could have an engine misfire or a drivetrain issue. I would check or fault codes to start.

You should be able to pay for trans service if you need it. Find an independent mechanic willing to do it if the dealer will not. - Nick at Pelican Parts
 
Badomski Comments: I have a 318 2003 with many problems with cutting out or not even starting at all. It has occasionally cut out when in idle for a a few minutes every second day. There was a problem with one of the fuel pumps but it has since been replaced and it's still happening. Please let me know if you have any ideas ASAP
February 2, 2014
  Followup from the Pelican Staff: I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and pressure fuel, volume and quality. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
sam Comments: i have replaced o2 sensor 0n 1999 328i bmw back in June 2013. can it go bad?
January 24, 2014
  Followup from the Pelican Staff: It is possible. If it is faulty again, I would check it for contamination. - Nick at Pelican Parts  
alcs Comments: Hi there pelican staff. I'm living in Indonesia and have purchased a 1996 e36 323i with 2.5 single vanos. I have been experiencing low rpm bogging/hesitation. I have rebuilt the vanos system and changed out the cam and crank sensors and timed the engine accurately. I had a look at the exhaust manifold and cat. There appear to be no oxygen sensors pre and post cat. Unplugging the mass air flow sensor makes no variation in performance. There are to connectors on top of the fuel rail. Are these for the bank 1 and 2 sensors? Having looked it appears the plug bolts in the manifold are factory. My question is. Shall I replace the mass air flow sensor and forget about the o2 sensors. Or replace all 3..mass.and o2s. The car was assembled jakarta indonesia. One more note. Adding fuel manually to the intake cures the bogging which tells me that she's running lean..thanks for reading.
January 21, 2014
  Followup from the Pelican Staff: I cannot offer much insight as I do not know what that vehicle came equipped with. You can check the basics, fuel, ignition and compression to start. - Nick at Pelican Parts  
kso Comments: hello, ive got a 92 325is. car runs great but the check engine light comes on when i release the accelerator pedal. any thoughts on where i could start my search?
January 17, 2014
  Followup from the Pelican Staff: I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
Fiesty88 Comments: Hi i have a bmw 316i se. Think its e36 model yr 2000. It seems to drive fine but when i come to stand still the revs drop really low to the point car shakes as if about to stall. The revs will hover up and down below 1rpm but once moving is fine again. Seems worse when cold and have noticed it does it less when i fill up with super unleaded instead of unleaded. Throttle body has been cleaned twice still does it and nothing comes up on diags. Any ideas?
January 16, 2014
  Followup from the Pelican Staff: Could be a fault in the idle air valve or the crankcase breather. With no fault codes, you'll have to test these items individually. - Nick at Pelican Parts  
Surfingbird Comments: Hello, i am the owner of a 316i, but my wiring harness is modified by previous owner... What i think ive done wrong is the lambda sond, i had to guess which cables where right. Do you have a diagramme for this, or can you tell me the correct colours?
Thank you.
January 8, 2014
  Followup from the Pelican Staff: We don't have your vehicle here in the US, so I don't have the wiring.

I would check that the heater on the o2 is wired properly first. Once you get those two wires out of the way, you can sort out the other two by trial and error. - Nick at Pelican Parts
 
stephen Comments: I have a 1998 BMW M3 that i purchased about a month ago. the car ran perfectly fine until the other day when i missed a shift and the rpm's went pretty high. IT then started misfiring on cylinder 5 i checked and it has spark and fuel. so that left compression. i checked the compression and all the cylinders were within spec except for cylinder 5 which had a dry test of 120 and a wet test of 150. i cant figure out what the problem is.
January 4, 2014
  Followup from the Pelican Staff: You will have to perform a cylinder leak test to see where the compression is going. Once you identify the source of the leak, you can plan a course of action. - Nick at Pelican Parts  
candameron Comments: hi i was driving my '98 328is home from work and i started smelling rubber. then when i would accelerate quickly the engine would rev but produce no forward momentum. i was able to drive the rest of the way accelerating slowly and had no problems. do you think its the oxygen sensor, drive belt, or maybe something else?
it wasn't slipping or catching on any gears so i dont think it was the transmission but im not sure.
also i've never had that problem before but when the engine is cold it usually has an irregular idle
December 26, 2013
  Followup from the Pelican Staff: Hard to say. Could be alternator, fuel system, plugged exhaust.

I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and pressure fuel, volume and quality. Once you figure out what is missing, it will be easier to diagnose. - Nick at Pelican Parts
 
candameron Comments: hi i was driving my '98 328is home from work and i started smelling rubber. then when i would accelerate quickly the engine would rev but produce no forward momentum. i was able to drive the rest of the way accelerating slowly and had no problems. do you think its the oxygen sensor, drive belt, or maybe something else?
it wasn't slipping or catching on any gears so i dont think it was the transmission but im not sure.
December 26, 2013
  Followup from the Pelican Staff: Hard to say. Could be alternator, fuel system, plugged exhaust.

I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and pressure fuel, volume and quality. Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
Ali almasri Comments: Dear sir,

Kindly note that i have bmw e36 318is and i chaned the engine to 325i now iam facing a problme which is when i try to drive the the RPM don't go more than 5 and note that back achs is for 318 does i have to change it whith adeferent one or there is any solousin for this problqm
November 27, 2013
  Followup from the Pelican Staff: Check if the exhaust is restricted. - Nick at Pelican Parts  
tom hall Comments: Hi have got a 2000 bmw 316i compact with the 1.9 8v engine in, get a problem only when the engine is cold will start and drove but will not get above 3000rpm until it warms up if you try to accelerate past this its just goes lumpy and no power is there, once the temp have warmed up pulls like a train again have replaced o2 sensor and spark plugs but still doin the same, any ideas please?
November 25, 2013
  Followup from the Pelican Staff: I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. I would also check fuel trim when the problem is present and not. This will help you decide if it is a fuel related problem. Then I would perform a fuel delivery system test. Check fuel pressure, volume and quality. - Nick at Pelican Parts  
SAMEER Comments: HEY GOOD AFTERNOON EVERY ONE I HAVE BMW 318I 2.0 SOME TIME THE BRAKE GOING DWON AND COMING SOUND LIKE DRRRRRRD I DON'T KNOW WHATS THE PROBLEM OVER THERE ANY ONE COULD HELP ME TO KNOWS THE PROBLEM
THANKS
November 24, 2013
  Followup from the Pelican Staff: Sounds like the ABS s activating from a bad wheel speed sensor but it's hard to tell without have any information about the car such as the year. - Kerry at Pelican Parts  
jose Comments: I have the bmw 530i 2006 n i check the s park plugs n got no spark can you help me
November 23, 2013
  Followup from the Pelican Staff: Does the check engine light come on when you turn the key on? I would check the crank sensor. - Kerry at Pelican Parts  
Lon Comments: 1992 525i O2 sensor relay coil wire has 12V and the switched groundfrom DMEis good. As soon as I connect the O2 relay the input power for the coil disappears, thus the relay is unable to function without the coil. I can jumper the relay to provide power however always hot-12V to the O2 sensor/heater but the check engine light goes on. Is this normal during initial startup, because the book says its an open loop during startup, then does the DME pulse the swithchedground to energize the relay during idle. Is my DME bad If I do not get power at operating tempt. to the coil relay?
November 9, 2013
  Followup from the Pelican Staff: I have to go by memory, I haven't worked on a 1992 525i in a while, there are very few left around here.

The o2 heater relay will be activated immediately after starting. It should run when the engine is on to maintain oxygen sensor operation.

What are you trying to fix, fault code or symptom? - Nick at Pelican Parts
 
Ershad Comments:




Hi, I have a 2008 bmw320i. The stop when safe and service immediately check light came on, and the car refuses to accelerate above 2500rpm. What could be the problem?

October 22, 2013
  Followup from the Pelican Staff: I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing. There can be many faults that set this message. I would guess it could be a misfire or transmission issue.
- Nick at Pelican Parts
 
Dido Comments: Hi. Just got a 1998 318is BMW. It consume gas like nothing. Suggestions were airflow meter mass flow meter. I replaced it but no change... Black smoke at the back exhaust. The idle is sometimes hunting. Thought of throttle valve but have not bought one to replace yet. thinking the O2 sensor in the exhaust could be as well. Now thinking what else can it be other than those mass flow meter, O2 sensor and the throttle valve. Worse it is doing 350km 218miles per full tank... not goo at all.
October 21, 2013
  Followup from the Pelican Staff: Check your o2 sensor, if it is stuck lean the DME will try to correct and enrich the mixture. You can also check the fuel delivery system, check fuel pressure, volume and quality and check that an injector isn't leaking, (system hold pressure with key off). - Nick at Pelican Parts  
andreas.mulle Comments: Hi! Hope you can help me! I have a 92 325 with a 96 m52b28.i found out not to long ago, that I dont have the rear o2 sensor its been cut. i have 3 in total, is that 328 or 325 ? anyways, to the problem. When the engine gets to normal temprature, it get very bad preformance, and does not run as it should a all. It also backfires, and struggles to get rpm, like it is hasitating. Now i have read a bit online, and all the symptoms says that its an o2 sensor. But the engine was running fine when i bought it, no problem at all, but it didnt have the o2 sensor then, when i bought it either, so that causes me to think that it might be some thing else? And ye, why dont i just start by replacing the cut o2 sensor? Whell, there shoud be a conector on a bracket on the gear box ? Correct me if im wrong but thats not ther either, and i have looked to see if it was just tucked away somewhere, but i cant seem to find it. So then i have to lay up new wiring, and yes that is something i will do, but its not firs pri, and this is not my stronges side, if its not the o2 sensor. First pri is to get the engine to run properly. But if you could link me a wiring diagram, that would be great.
Wow that was a lot, hope you can help me, im pretty desperate, seeing that i need to have the working as soon as possible. Its my only car.
October 20, 2013
  Followup from the Pelican Staff: A repair manual should have the wiring for your vehicle. I am not aware of any online diagram to link you to.

If the engine runs poor hot and backfires, fuel delivery, engine timing and exhaust back pressure. - Nick at Pelican Parts
 
Jacen Comments: Hi, I have a 1994 BMW 530i with 160k the alumaslisp block which was put in at 82k. I have been getting a major headache from this car. For some reason or other it keeps shutting down bank 2 of the motor the entire left side of the motor. When I mean shutting down there is voltage to the coils but it seems the injectors have been shut down. I have replaced the MAF, ICV, intake temp sensor, purge valve, PCV, fixed 8 vac leaks, and now I am getting an O2 error#1212. which I believe is on the left side also. The car shakes badly at idle, has no power at all until 4200rpm, then it will lay you into the seat. Been to 6 different mechanics no one understands it, nor I. I have also replaced fuel REG, filters cam sensor and tested all connections to the DME all tested great and all coils and plugs were also replaced. I also did notice it does misfire sometimes. I am so lost, any ideas? Also I haven't replaced the o2 as of yet because I am unsure if they are truly bad, I do not know if the have been replaced or not from the po. I have been thinking can an o2 sensor shut down a bank of an engine? I do not know Oh also did a NOID light test injectors are fine.
October 19, 2013
  Followup from the Pelican Staff: The DME will shut injectors off if it sees an engine misfire. I would check the engine for a misfire before the injectors are shut off. - Nick at Pelican Parts  
Larry Comments: 1984 318i. I replaced the O2 sensor and the plugs. Now it stutters and hesitates at idle and when trying to maintain a level speed. I am going to check for vacuum leaks but wanted other suggestions because car ran smooth before tune-up.
October 18, 2013
  Followup from the Pelican Staff: Are the plugs gapped correctly? Take a look at the ignition wires are make sure they are ok. Also look for a vacuum leak.
- Nick at Pelican Parts
 
Darrensy Comments: I have a 1999 323i. I have a P0303 cylinder 3# misfire detected. Can you please help.
October 15, 2013
  Followup from the Pelican Staff: Start by checking spark on cylinder 3. I would use an HEI spark tester. If spark is good, check fuel injector pulse and compression. - Nick at Pelican Parts  
JACQUES Comments: MY BMW 318i 2002 TOURING STARTS AND IDLES FOR 8 MINUTES AND THEN CUTSOUT,NEXT DAY THE SAME THING BUT DOES NOT START AGAIN?MY BATERY IS ALSO FAULTY,COULD THE BATERY BE PART OF THE PROBLEM?IT ALSO IDLES COARSE.PLEASE HELP!
October 11, 2013
  Followup from the Pelican Staff: I would install a new battery first, and check the charging system to make sure it functions correctly.
- Nick at Pelican Parts
 
BoTyler98 Comments: Fixed the over heating problem it was low on coolant. Now it doesnt over heat but still no power. Doesnt want to accelerate it will accelerate to 3000 rpm's but it takes forever to pick up speed after that. It makes it difficult to make it on the on ramp to the highway. What could this be?
October 5, 2013
  Followup from the Pelican Staff: I would pressure test the cooling system to see where the coolant went. There has to be a leak. If your engine has a bad head gasket, it could have a low power issue.
If the engine runs well at idle and only has an issue under load, check fuel pressure, volume and quality, then check exhaust back pressure. - Nick at Pelican Parts
 
mibz Comments: I hv bmw 320i,the problem is,it fails to start in the morning,but after the weather get warm up it has no difficult in starting nd a small missfiring.wat shud I check?
October 4, 2013
  Followup from the Pelican Staff: The misfire is likely related to the no start issue. Possibly fuel related.
When your engine doesn't start you’ll want to check the basics. Check spark, fuel injector pulse and pressure fuel, volume and quality. Once you figure out what is missing, it will be easier to diagnose. - Nick at Pelican Parts
 
miamifan115 Comments: Comments: I have a 1991 bmw 318is that runs really well but when the car is warmed up and i stop and turn it off....It struggles to catch its idle but as soon as it does its fine. It does this every time i stop.It runs fine other than that
September 23, 2013
Followup from the Pelican Staff: Will the engine run smooth if you increase the throttle? Also, have you checked fuel pressure and volume when the problem is present? This could be something as simple as a torn intake boot or an air leak or a fuel delivery issue. - Nick at Pelican Parts

The car run fine...No throttle pick up problems...Just acts like its flooding out on restarts,but as soon as it catches its idle its fine...Do you think maybe injectors are leaking through.
September 26, 2013
  Followup from the Pelican Staff: You misunderstood my question, does the engine idle if you increase the throttle a small amount?

- Nick at Pelican Parts
 
BoTyler98 Comments: I have a 1995 BMW 318IS it has no power what so ever when im at a full stop and i push the peddle it feels like it does want to go. I cant even gun on the on ramp to the highway. Engine light comes on and off every five mins. What could this be? Also it over heated the other day so i shut it off and parked it what could cause that?
September 25, 2013
  Followup from the Pelican Staff: I would suggest addressing the overheating issue first. It can be caused by low coolant, a faulty thermostat or water pump. If your engine is overheating the engine will lose power.- Nick at Pelican Parts  
miamifan115 Comments: I have a 1991 bmw 318is that runs really well but when the car is warmed up and i stop and turn it off....It struggles to catch its idle but as soon as it does its fine. It does this every time i stop.It runs fine other than that
September 23, 2013
  Followup from the Pelican Staff: Will the engine run smooth if you increase the throttle? Also, have you checked fuel pressure and volume when the problem is present? This could be something as simple as a torn intake boot or an air leak or a fuel delivery issue. - Nick at Pelican Parts  
dalevid Comments: Hi, I have a 1995 E36 325IC. The engin idles nice but I have two types of symptoms. 1st thing I notice is when I am accelerating and it gets up to about 3000 RPM before it shifts the power goes down a bit and acceleration stops surging then it resumes and shifts. This has been like this since I bought the car about 4 months ago. Now recently the car misses for a fraction of a second when starting from a stop and almost feels like it will stall but it immediately keeps running. Wondering what the problem is.
September 12, 2013
  Followup from the Pelican Staff: Your first issue could be normal, the DME will reduce power to the engine right before the trans shifts to reduce the load on the trans, most people never notice it. Second I would check your ignition system, plugs, coils boots, wires and so on, also make sure you don't have a vacuum leak or a cracked intake air boot.
- Nick at Pelican Parts
 
ikedog Comments: I have a 1994 325is I had a new cat installed and a new oxygen sensor and it still failed the smog. What could be the cause for smog failure still. How many O2 sensor's are on this car.
September 10, 2013
  Followup from the Pelican Staff: Your vehicle could have two oxygen sensors. I cannot comment on the smog failure without knowing all of the gas readings. Each gas can be created by different failures. - Nick at Pelican Parts  
gerry Comments: i have a 1992 bmw 325i,how many 02 sensor does t have ,coz ive been having eratic idling cold start and ive already replaced icv,map but still having the same problem..need sos advice pls
September 5, 2013
  Followup from the Pelican Staff: There should only be one before the cat. Cold starting problems could be related to a vacuum leak, inspect the engine for a cracked intake boot, vacuum line or leaking gasket. You can also check the crankcase vacuum, this will help you diagnose the crankcase breather valve.
- Nick at Pelican Parts
 
legend7 Comments: hello. my computer revealed misfire detection1, 2 and ignition cylinder 3. my technician said we need to replace MAF and the ignition coil. can i change the MAF with a 0280200205 number to 0280200204? i am actually having some difficulty finding a replacement for my vehicle. BMW 1996 316i e36
September 5, 2013
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
totoy_golem Comments: hi, i have a bmw 316i 1996 MT model. my problem is when i run into around 10-30 kph, my rpm goes all the way down. i need to scramble going to neutral or else my engine will stall. it happens most of the time. Do you think it is the o2 sensor problem? or the fuel pump? thanks
August 31, 2013
  Followup from the Pelican Staff: - Nick at Pelican Parts

Sounds like you could have a problem with the idle motor or the air flow meter. I would Check with a factory scan tool and check for any codes.
 
saj Comments: Hi i have a Bmw E36 318I R reg, reacently the car has been feeling like the fuel is runing out, every now and the the revs have been shooting up and hold there for about 30 seconds and comes back down, the car stall and diffulty starting back up, i have changed the idle air valve and a hose that had split but still no joy, i'm thinking about changing the maf soon, can any one help, thank you in advance.
August 30, 2013
  Followup from the Pelican Staff: I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set.
You could have a vacuum leak or a faulty crankcase breather valve. I would check both, inspect the engine for a cracked intake boot, vacuum line or leaking gasket. You can also check the crankcase vacuum, this will help you diagnose the crankcase breather valve.

- Nick at Pelican Parts
 
help me Comments: I have a 1997 318I the car runs fine when its cold but after its warm and you shut it off then restart it it runs real rough and makes a squealing noise like a vaccum leak but cant find anything? any suggestions?
August 27, 2013
  Followup from the Pelican Staff: Try taking off the belt and see if it still squeals on a hot restart. Sounds like one of the pulleys may be seizing like the air compressor. Does it have with the AC on and off? If you feel it's a vacuum leak try spraying carb spark around the intake and see if the rpm picks up. Please be careful not to start a fire. - Kerry at Pelican Parts  
Boys Comments: My BMW 320I shows the engine warning light any displays a code 4F when checked with the diagnsotic tool,description for the code is O2-sensor heater behind catalytic converter,bank 1,engine performance is very poor, what can i do?
August 20, 2013
  Followup from the Pelican Staff: This could be a failing oxygen sensor. Check that the exhaust system is sealed and there are no other problems influencing the o2 signal. If all else is good, replace the o2. - Nick at Pelican Parts  
E Man Comments: Hello, I have a 95 325i E36. My engine recently has been idling irregularly, especially when cold, lagging during acceleration sometimes, and giving me terrible fuel economy. It can maintain 25mpg on the highway, but I get killed during acceleration. It's currently averaging 15mpg. The idle will jump to 1000 rpms, bog down to 500 rpms, then settle at ~750 rpms as it's supposed to. It also does this when I lightly throttle in order to get into first gear. Now what's puzzling is generally the engine light will come on if the O2 sensor is faulty, but mine never comes on at all. Where should I start in fixing this?
August 19, 2013
  Followup from the Pelican Staff: You might have a torn intake air boot. I would start by inspecting the intake boots and checking the DME for fault codes. Even if the MIL is not ON, there may be pending codes. - Nick at Pelican Parts  
Maestro Comments: I have a new Bosch Oxygen Sensor that I got for a GMC Yukon...it is part #F00HL00046. It has a four-pin plug, pins all in one flat row, white white black grey. Can I remove the o2 sensor from my 95 e36 M3, cut its plug off, and splice it onto this o2 sensor?
August 13, 2013
  Followup from the Pelican Staff: No, you will have to get the right sensor for your vehicle. - Nick at Pelican Parts  
TK Comments: A E36 M3 1997.
I used Bavariantechnic tool to diagnose the check engine light, it shows "25 Lambda probe heating probe 1" What is the problem and which sensor should be replaced?

Thanks
August 11, 2013
  Followup from the Pelican Staff: Probably bank 1 pre cat O2 sensor has a heater problem. Ignition on power goes to the heater element (one of the two white wires) and the DME pulses the ground side to artificially heat the O2 sensors during idle. Exhaust gases heat them up while driving. Check resistance between the two white wires on the sensor and compare to another sensor that you do not have a code for. - Kerry at Pelican Parts  
simon159 Comments: Hi I have a BMW E36 318i. I just got the car from the previous owner. It was working fine but few days ago i was driving it with no problem and suddenly, the engine temp went up real fast. Thank God i was 5 minute away from home and it was night . I managed to park the car but the red light in the temp meter was on. I turn off the car fast and open the hood so there is circulation for about 10 minutes. Suddenly 5 minutes after i close the hood, there was a sound and white smoke came out. I send for repair and it was a broken water host and I got it fixed. Now when I drive for the first 5 minutes, the temp is fine but after that it rise very fast and but there is no leak from the radiator to the water host, however there is a squeaky sound from the engine when I drive it. The temp drops a little if i put the gear in neutral. The previous owner said to me the car was not started for 6 months. please advice.
August 8, 2013
  Followup from the Pelican Staff: Sounds like you have a faulty head gasket. I would pressure test the cooling system. If the system does not hold pressure and there are no external leaks, you may have a faulty head gasket. - Nick at Pelican Parts  
way3000 Comments: Hi Pelicans!

I've just dumped a 325i M50 engine in my E36 and it "purrs" well, except I need to find a spot for my o2 sensor. What would happen if you put it in a x-manifold plug, so it just reads on 3 of the 6 cylinders? would that make any difference? else i will have to cut open and weld the exhaust somewhere and I don't have the tools for that.

thanks alot for great articles
August 7, 2013
  Followup from the Pelican Staff: If the 02 is reading one bank, it will only be providing feedback control for one bank. Therefore if a fuel delivery issue develops on the other cylinders, the DME will not be able to compensate. - Nick at Pelican Parts  
E36316i Comments: What happens to the car if you install the wrong oxygen sensor? For example, installing a 318i O2 sensor in a 316i?
August 5, 2013
  Followup from the Pelican Staff: If the sensor wiring and electrical connectors are the same, nothing, the sensor would operate normally. - Nick at Pelican Parts  
Alohae36hawaiikai Comments: Put in a new MAF and cleared the codes and she is running better. But am getting an intermittent Peake 46 code which is either O2 sensor or knock. I have only been putting in regular but plan on putting in premium to see if the code goes away.

July 30, 2013
  Followup from the Pelican Staff: Thanks for the Info. We appreciate it. - Nick at Pelican Parts  
Alohae35hawaiikai Comments: Hi, I have a 1994 e36 325is that looks to be modified. It has a Motronic 0261200403 DME and a 6 wire MAF and is non vanos. I have purchased a new MAF but used a Peake code reader and found a 29 code O2 fault along with the 46 MAF failure disconnected to allow the engine to run and not stall. Look like the car only has one O2 sensor but the 403 DME looks to be a 1991-92 which had two O2 sensors. Can I get the check engine light to go off if only one sensor? Also not getting a dash temp reading of which not sure that the newer car was set up to have a direct temp sensor input like the older e36 signal from engine controller? also tach and fuel consumption meter not working. Thanks for any help
July 23, 2013
  Followup from the Pelican Staff: Let's focus on one issue. If your DME is setting fault codes for a sensor your engine does not have, there has to be a coding issue or you have the wrong DME installed. I would have the coding checked by a BMW repair shop. if the DME expects to see the sensor and it is not there, the check engine light will nto go out. - Nick at Pelican Parts  
Milton Comments: my bmw 3 series has it's engine light on. i've been running it that way for a month now. it was lazy when climbing hills. i had the exhaust stuffed with some spongy wool. after 3 days of driving, now the car won't start. i've noticed that the pump would not send fuel when switch is turned on, unless power is taken from one of the fuses and placed on one of the cables on the pump before fuel flows, but still the car won't start. i've bought a brown new pump and changed plugs, still no start.the nussels spray fuel.pls help me out.
July 22, 2013
  Followup from the Pelican Staff: Check if your exhaust system is restricted. If you have fuel and spark and the engine won't run, you could have a compression issue. Start by checking how the engine is breathing. - Nick at Pelican Parts  
P55 Comments: Hi my missus has a 2000 BMW 316i Compact 1895cc 8V SOHC. There is a problem at start up where for the first 2 minutes there are power problems tick over is fine. Silly solution is to wait a couple of minutes before you drive off – yes this does work but it is an annoying fault. If you try to drive of earlier you get a “hot cut” – the engine almost dies. Another strange fact is she has notice that things are not so bad if you use lower octane cheap fuel. Any suggestions on what may be the root problem?
July 17, 2013
  Followup from the Pelican Staff: Sounds like you have a fuel delivery problem.
I would check fuel pressure, volume and quality. - Nick at Pelican Parts
 
MrJW Comments: Hi, last week I took my BMW 320ci 2004 to my local halfords garage as the engine light was on. After diagnostics they suggested it may be the O2 sensor as the fault was lambda related. They ended up changing two as they said there was two fitted!? I took their word for it. After driving it for 20 minutes or so the engine light has now come on. The car runs fine, and was never sluggish or burning up fuel. Any help would be greatly appreciated! I'm fearing a new cat!
July 15, 2013
  Followup from the Pelican Staff: If the code was P0420 or P0430 then it is probably a bad cat. If they were O2 sensor codes then you may have a vacuum leak or a dirty MAF but I'm only guessing - Nick at Pelican Parts  
stevenage boi Comments: hi guys hope you can help
my 95 320i e36...has very rough idling on startup and does not get any better when warmed up....it sounds like its running on 5cylinders....had this problem a while ago ...but it seemed to reset itself and not do it again...this time its there all the time...could it be the icv?
the revs go up and down but generally it runs at around 500 which shakes the car..seems to not be so good on the road performance wise either...any help would be great...thanks so much
July 7, 2013
  Followup from the Pelican Staff: Try unplugging each injector one at a time and make sure the rpm drop equally for each unplugged injector. You may also have a vacuum leak that can cause the idle to surge. Try spraying carb cleaner around the intake and when the rpm flares up when you spray in a certain area that is the source of you leak. - Nick at Pelican Parts  
Alaska Matt Comments: 94 325i with single o2 sensor. Replaced sensor and reset the computer, after a few minutes of running rough it ran great again. 800 miles later it started running rough again. Exchanged the old sensor for a new one and started running smooth again. 1000 miles later same problem. Don't think I can exchange it a third time. Why is it going out so quickly? Each time I have been getting the 1221 code.
June 25, 2013
  Followup from the Pelican Staff: You could have an issue with sensor contamination. Check that there is no oil or coolant leaking into your exhaust system, ruining the oxygen sensor. - Nick at Pelican Parts  
Axel Comments: Hi, I have a 2001 BMW 318ti - it seems to backfire once the engine gets up to normal temperature, but is fine whilst the engine is cooli.e. just after starting it... Do you know what might be causing this? I think it might be a sensor?

Thanks
May 31, 2013
  Followup from the Pelican Staff: i would inspect the crankcase breather valve. A backfire could be caused by ignition timing or a lean condition. - Nick at Pelican Parts  
paul11968 Comments: hi i have bmw 318 1997 revs go up and down when cold gets better when warmed up no warning lights can u help plz
May 22, 2013
  Followup from the Pelican Staff: You could have a vacuum leak that is affecting the idle. Once warn the engine can better deal with it.

Check the engine for vacuum leaks. also check the coolant temp sesnor. - Nick at Pelican Parts
 
J.M.D Comments: Hi i have a E36 1995 325ic. Some times the car has the pull/torque when accelerated but sometimes not. Is it because the O2 Sensor is damaged ? Should i replace it ?
Or is it completely due to a different issue ?
May 14, 2013
  Followup from the Pelican Staff: A faulty o2 sensor would usually set a fault code and illuminate the check engine light.

I would inspect your fuel delivery system. Check fuel pressure, volume and quality. - Nick at Pelican Parts
 
Verstappen Comments: Well this is really weird, I looked all over for the wiring/conectors for the two upstream sensors and found nothing, so I decided to do some research and this particular BMW shop told me my particular model has a simplier design and it only uses 2 sensors, 1 before the cat and one after. They sent me a diagram and now I am shocked because I have never seen this in any other of the BMW's I owned at some point.

This is a 1998 323is with a M52 engine in case it matters.

BMW always surprises me one way or another.
May 6, 2013
  Followup from the Pelican Staff: Looking at the wiring I see two sensors. Same with parts. I would like to look the information for your specific vehicle up. I think I remember hearing this in the past, about single o2 pre and post cat engines. - Nick at Pelican Parts  
Verstappen Comments: Hey! I found something really odd, I have 98 323is and while I was looking around today I saw that it only has 2 oxygen sensors! one pre cat and one post, the bungs on the manifolds are blocked with bolts. Is this something normal? I heard of a few other cars like this here in the US.
May 5, 2013
  Followup from the Pelican Staff: The vehicle should have four, two per engine back. Are the wiring harnesses tucked away to the side? They would be near the connectors for the other oxygen sensors. - Nick at Pelican Parts  
Joker Comments: I hate auto correct on my cell, I apologize, let's try this again, I have a 94 bmw 318i, I had a rebuilt engine put in, it shows my car is over heating on the temp gauge but its not, my check engine light is on too, I replaced the water sensor, the engine coolant sensor and the o2 sensor. Any ideas I keep getting the code 1223
April 23, 2013
  Followup from the Pelican Staff: 1223 refers to the coolant temp sensor. I would double check the wiring and connection at sensor. Have to check the operation of your thermostat and water pump? These items could cause your engine to overheat. - Nick at Pelican Parts  
david Comments: I have a 1996 bmw 328 is.my check engine light came on an after taking it to a local service station was told on needed to replace my left rear o2 sensor he said that there were 4 of them the car has shown no discernable problems since the light came on about 2 weeks ago. Runs fine and smooth, no increrased gas consumption etc.Do I reaaly need to replace it?? He's telling me the part alone is $235. thnx
April 1, 2013
  Followup from the Pelican Staff: Oxygen sensors are monitored by the DME as part of OBDII standards. When they begin to fail, or perform slow, a warning light will illuminate (check engine light). Your fuel economy will also degrade. If your mechanic states the sensor is faulty, replace it. - Nick at Pelican Parts  
vicky Comments: hello sir, my E36 some time run very smooth and some time very
heavy but the power is ok
March 24, 2013
  Followup from the Pelican Staff: I need a better description of your problem to be able to help you. Could you describe the problem, when it happens, what is going on? - Nick at Pelican Parts  
ledio Comments: Hello,
I have a 2001 bmw 325ci and the check engine is on for oxygen sensors. the first o2 sensor has 3 wire power, the second o2 sensor has 2 wires with power, the 3 and 4th oxygen sensors dont have power at all. the car is running good and no issues, but the check engine light is on and i cant pass inspection. I changed the 1st oxygen sensor and it still states that even that one is not working.
December 16, 2012
  Followup from the Pelican Staff: The first O2 sensor should not have 3 wires with power but only 2 like the next one. It sounds like the O2 sensor heater wire is not being grounded. You are going to have to check this wire from the O2 sensor to the PCM and make sure it is not broken - Nick at Pelican Parts  
mixxy Comments: Hi I have a bmw e36 316i with an m40 engine. And it don't have o2 sensor can that be? 10x
November 11, 2012
  Followup from the Pelican Staff: Yes O2 sensors were mainly on US vehicles - Nick at Pelican Parts  
gee singh Comments: hi I have a e90 320d m sport.the car is using to much fuel.I had it put a computer and it pointed out that one of the sonsors was reading a -10° so I replaced the Lambada sensor.but it still reads the same.what can I do please help
September 13, 2012
  Followup from the Pelican Staff: -10o is a temperature reading. Could it be you have a bad coolant temperature sensor? - Nick at Pelican Parts  
Michelle Comments: Hello, Looking for follow up comments on my post for my O2 sensor. Any suggestions? Been replaced 2 times same code still comes on P0430 Bank 2. Do you think it the Cat Conv?

Thank you
August 31, 2012
  Followup from the Pelican Staff: yes it sounds like your bank 2 cat has failed - Nick at Pelican Parts  
Michelle Comments: Also should mention that my service engine soon light comes and goes. I will come on for a few days and then go out again. Usually comes and goes 2x per tank of gas. I get about 19 mpg and mostly drive around town.
August 7, 2012
  Followup from the Pelican Staff: Without knowing the details about the car you may have a problem with a leak in your EVAP system. This system checks for small leaks in your gastank system and can cause the service engine light to come on - Nick at Pelican Parts  
Michelle Comments: Hello, the code is P0430 Bank 2.
Thank you
August 5, 2012
  Followup from the Pelican Staff: Yeah it is probably a bad bank 2 cat but it could also be an exhaust leak - Nick at Pelican Parts  
Michelle Comments: Hi 2003 BMW 325i service engine soon on, computer states o2 sensor bank 2, replaced it. Cleared code. 2 days later light on and computer says same code. cleared and day later back on. Any ideas?
July 25, 2012
  Followup from the Pelican Staff: What is the fault code number? You could have faulty wiring or mistakenly replaced the wrong sensor. - Nick at Pelican Parts  
frankie Comments: i have a 95 318is and i have a problem when it rains and i go over puddles, the engine starts to rev up and down and wont accellerate, after a while it starts idling well again..it happens when it rains and sometimes when i start the car, then it corrects itself . What could this be , please help
June 28, 2012
  Followup from the Pelican Staff: Check the passenger side of the engine compartment by the firewall and see if you're getting water into your DME computer which is mounted in the firewall. - Nick at Pelican Parts  
kevin Comments: Hi , u have an excellent website. I have a 1996 320i with m52 2.0l engine . i am trying to find which oxygen sensor it uses . i only locate one downstream on the exhaust manifold. the one thats in it wire was broken off completely but i cant locate where the connector came from. need your help please.could u send some info.
May 23, 2012
  Followup from the Pelican Staff: I opened a post in our forums. A Pelican community member may be able to answer your question.
- Nick at Pelican Parts
 
paulmurphyhomes Comments: 2 or 4 for a 1996 M3?
April 23, 2012
  Followup from the Pelican Staff: I think you have 4, 2 before the cats and 2 after the cats - Nick at Pelican Parts  
richard Comments: hi my question is .same sensor works on auto and manual transmission? or they are different?
March 20, 2012
  Followup from the Pelican Staff: The wiring harness might be different lengths, but the sensor will be similar. - Nick at Pelican Parts  
Jeff328i Comments: Hello, I bought a universal O2 sensor that has 4 wires. It came with butt splices to connect it to the existing harness, however the OE sensor wire colors do not agree with their instructions. So I wired it from the Bentley BMW service manual based upon the pin outs, e.g. 1 = signal, 2 = signal gnd, 3 & 4 = heater example only as I do not remember the exact pin outs at this moment. Anyway I wired it per the pin out in the Bentley BMW service manual and the car is idling rough & has a solid miss. Therefore I am assuming I have wired it incorrectly electrical wiring diagram maybe inaccurate, but I thought the pin out would be correct rather than going by wire color. Any ideas?
February 13, 2012
  Followup from the Pelican Staff: It's hard to say if the miss is from a miswired o2 or a new issue. If the o2 is miswired it could cause rough running or an incorrect mixture. If you are unsure about the wiring, I would use the correct oxygen sensor, a direct fit. With universal sensors, it is up to you to be sure it is installed correctly. Using the wiring from the sensor and your vehicle. - Nick at Pelican Parts  
sawalker Comments: I have a 1999 German made bmw e36 316i. There an unusual sound from the engine. In the morning when I start it it takes a long time to start and when I accelerate, it takes time to pick. Very often, the sound picks and drops. Could this be the o2 sensor.
February 2, 2012
  Followup from the Pelican Staff: I'm not sure you mean by "pick" and "drop". Could you describe the issue a bit more? - Nick at Pelican Parts  
An Comments: Hi, my 95 m3 has been running very sluggish... when i start the car, i would see white smoke coming out of the exhaust and if i let my car warm up for more than 5 minutes, the check-engine light would come up and when i drive, it would feel like the car is studdering and it would struggle to go. Yesterday at the gas station, i tried to turn my car on after putting gas and the car would start up but it would rev from .5-1 rpm then it would backfire and shut off. When i took it to the shop, they told me it was a vacuum leak, would that be the problem?
February 1, 2012
  Followup from the Pelican Staff: White smoke is an indicator of an internal coolant leak. Check your coolant level. If it is low, pressure test your cooling system. if the system does not hold pressure and there is no external leak, your head gasket may be faulty. - Nick at Pelican Parts  
Rui67 Comments: Well i didn't get a reply to my issues but hey SORTED!
All it was, was the air filter, now the car runs smooth. :
January 25, 2012
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it. - Nick at Pelican Parts  
Rui67 Comments: Hi my 1996 328i the idle starts has the engine get hot and sometimes when i stop at the trafic lights the engine cuts off. Would the oxygen sensor cause that! I have change the oil new plugs. The car runs well on a long straight drive but as soon as i reduce speed or come to a stop the idle starts and the engine on two occasions start on of them i was going down hill and the battery light come on but i touch the accelerator and the engine was on again what seems to be the problem?
January 22, 2012
  Followup from the Pelican Staff: I would check the engine for vacuum leaks. During low RPM a vacuum leak could create an idle issue, expecially when returning to idle from a cruise.- Nick at Pelican Parts  
ray Comments: hz





Hi my honda accord 2000 has check engine lights is on and i chechet it and i got code - Ho2S heater sensor P1167 please what is means this cod thanks in advance


January 18, 2012
  Followup from the Pelican Staff: The code refers to a fault with the air fuel ratio sensor. - Nick at Pelican Parts  
Dieter Schweininger Comments: End my nightmare.I own a 2004 325 i and I am having codes p2237oxygen sensor pump current circut open bank #1 sensor,p0174bank #2 system too lean,and p0171bank #1 sytem to lean.I know one leads to the other two,but need to order the right replacement part.Thanks for your help , Dieter
December 28, 2011
  Followup from the Pelican Staff: The code refers to bank 1 sensor 1. That is the oxygen sensor closest to cylinder #1, before the catalytic converter. - Nick at Pelican Parts  
Tonyp Comments: Hi Wayne, I have a 2002 BMW 320i, the car runs really nice even though I have over 300k. Lately I've notice when I accelerate in 2nd,3rd,4,5th gear, my car is bogging out and evens out as I go faster, Feels like the car is choking out. Could this be faulty spark plugs or o2 sensor? I thought I had bad gas, but it's not the case. Thank you, tony.
December 9, 2011
  Followup from the Pelican Staff: Check engine backpressure. You may have a restricted exhaust. It wouldn't hurt to perform a fuel system test also. I would check fuel pressure, volume and quality.- Nick at Pelican Parts  
nc3 Comments: I have a 1995 BMW M3. How many o2 sensors does this car have. I have replaced 1. I can't find any other but have been told there are 2.
November 28, 2011
  Followup from the Pelican Staff: If you vehicle has two oxygen sensors, the second one would be behind your catalyst.

Give our parts specialists a call at 1-888-280-7799. They can help you sort this out. - Nick at Pelican Parts
 
CK Comments: My 1992 320i serial AL49133 is running rich - spark plugs are sooty.
But when I tried to troubleshoot the O2 sensor, I couldn't find one.
There isn't even a bung to insert it into the exhaust.

Is it possible to retrofit one ? The ECU is 0261 200 402
November 17, 2011
  Followup from the Pelican Staff: The parts diagram shows an oxygen sensor right before your catalyst on the top of the pipe. - Nick at Pelican Parts  
8879gw Comments: Hi i have a 1999 e36 318ti compact the engine has been running really sweet since i bought it then all of a sudden while i was out in it i pulled up switched engine off when i returned 1 minute later i started the engine and it chugged like crazy like it was missing i cleaned plugs and also bought a new set that made no difference swapped coil still nothing i have found that no1 cylinders injector has no electrical feed going to it by using a test light on it while engine was running. Can anybody help me please ?
November 7, 2011
  Followup from the Pelican Staff: The injectors may be shut off due to an engine misfire. i would try to isolate the engine misfire. Start by checking the DME for fault codes. A fault code may indicate what cylinde ris misfiring.

To check if the injector is being shut off due to misfire, clear the fault and restart the engine, the injector will fire until misfire is determined to be too high, then injector will be shut off by the DME. - Nick at Pelican Parts
 
Tom Comments: Hi,I have a 99 323i and can't seem to figure out why my engine light is still on. I have read the codes which are 1087 and 1088 and have replaced all four of the oxygen sensors. Still the check engine light stays on, any idea why?
October 31, 2011
  Followup from the Pelican Staff: The codes are for slow response. I would check the intake and exhaust system for a leak. A leak can cause the oxygen sensors to react slowly. - Nick at Pelican Parts  
fsh Comments: hi, i own a 2001 330i, and ive recently had a problem with the engine or coolant temp..which ever it is, ill drive it for a while and the temp goes up. my coolant levels are good, so i dont know what the problem is..BTW: i lost the origial oil cap and got a replacement from an autoparts, it also seem to be leaking oil from there could that be the problem? help :
October 14, 2011
  Followup from the Pelican Staff: There may be an updated part with wiring harness. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part. - Nick at Pelican Parts  
Cliveyboi Comments: Hi I have a 1998 316i Automatic, when at normal speed the car is good but when I use the kick down nothing !! it revs and revs but nothing ! So I took it to my local garage and they said it was a faulty oxygen sensor so they replaced this and it was great for 6 weeks now its happening again ? there is no dash light on so I am at a loss . I am sure sensors dont go that quick and is there any other things I need to look out for and could it be the sensor again ? Thanks and regards Clive
October 12, 2011
  Followup from the Pelican Staff: It sounds like your transmission is slipping. I would checkthe fluid level and conditon. Also check the DME for fault codes. There may be a fault related to transmission slip. - Nick at Pelican Parts  
Sej Comments: I have a BMW e46 325ci sport I changed the oxygen sensor but still has no power it only does about 30 miles an hour I'm lost and don't know what to do
September 25, 2011
  Followup from the Pelican Staff: You could have a restricted exhaust or a fuel deliver problem. Check exhaust backpressure and perform a fuel delivery system test. Check fuel pressure, volume and quality. - Nick at Pelican Parts  
FIX Comments: I just replaced the O2 on my 1995 E36 325i because my CEL came on and mysteriously went out a couple of minutes later. I pulled the stomp code after I got home and sure enough, it was an O2 code.

On my car, the sensor was located in the super hard to reach spot like in photo #2. I used the special sensor removal tool Pelican # PEL-4491B and had to fiddle around with it some to get it loose. I found it was easier to go at it from the driver's side of the car and to orient the removal tool so that the flange that fits to your rachet is on the upside and not against the exhaust pipe. Had to loosen the sensor about 1/8th of a turn at a time and use a small cheater bar, but finally was able to loosen by hand. Make sure the tool is on the sensor real well, you don't want to round the corners. Mine felt like it was just barely making enough contact, so be careful. Pretty simple job though, only took me about 45 minutes. Thanks for the write up!
September 11, 2011
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help. - Nick at Pelican Parts  
Greg Comments: Hi, I have a 95 M3 US Spec, Check Engine light was coming on once in awhile, and failed inspection for high hc at hidle, had the 02 sensor replaced and passed for inspection, now two-three weeks later check engine light is coming on time to time again, idles low 700-800 rpm and from time to time bogs down when accelerating then light and bogging goes away other wise car drives fine, any ideas?
August 31, 2011
  Followup from the Pelican Staff: This could be a number of things. I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing. - Nick at Pelican Parts  
Flint1976 Comments: I HAVE BMW 318I SE TOURING REG 2002 [FACE LIFT STYLE] IT DRIVES BEAUTIFULL,BUT AFTER A WHILE IT THROWS OUT WHITE SMOKE.COULD IT BE THE CAT/CONVERTOR,I HAD THE BREATHERS DONE AND FILTERS ON A SERVICE.THE HEAD GASKET HAS NOT GONE,ANY IDEAS WHAT IT COULD BE
August 22, 2011
  Followup from the Pelican Staff: White smoke is likely coolant. I would pressure test the cooling system. If the system will not hold pressure and there are no external leaks the head gasket may be faulty. - Nick at Pelican Parts  
cyclingkevin Comments: I changed both right and left #1 oxygen sensors before cat converter. I still get engine light after it warms up. Runs fine cold and then bang it gives engine light and starts running ruff. I put tester for codes and it still says #1 oxygen sensor and now it says #2 oxygen sensor is bad. Could the #2 be bad and causing a fault code on the #1 that I already changed? Possibly a bad new sensor? I am looking on where the #2 is located after the cat and how many sensors. Would you know this and how many #2 sensors their are?



I also cleaned all the electical connectors I could find in the engine compartment and on the sensor connectors.



Thank you for any answers.
August 19, 2011
  Followup from the Pelican Staff: If your vehicle has 4 oxygen sensors, two will be before the cat, likely in the manifol and 2 will be right after the cat in the exhaust pipe. The code may not denote a faulty sensor but instead something else that is causing a fuel control issue. I would double check the code and go from there. - Nick at Pelican Parts  
bajorgep Comments: Hi my Bmw 318is-ti 1,9i M44 engine type and I dont have any error code, but I have exesive fuel consum 20liter/100 km in the city, what can be the problem? The engine is working fine, but the fuel consum is exesive.
August 8, 2011
  Followup from the Pelican Staff: You could have a leaking fuel injector or an air leak causing a rich condition. - Nick at Pelican Parts  
terry Comments: hi again ,do u think a 530i 2000 model engine could fit on e36 bmw body ??3L insted then 2L engine ,the mine thing for me is the engine mounten will fit the same??thanks from australia
August 6, 2011
  Followup from the Pelican Staff: The engine mountings may be similar. You will need the swap the wiring and electrical control units along with the engine. It will be a hit or miss process. - Nick at Pelican Parts  
terry Comments: hi ,i have a
1993 320i e36 and i checked the ox sensor on the car ,and its made by simens ,and i cant fint the same brand ,so i have a bosch one do u have any digram how to install the new wireing plz,one more thing to get the simens brand in australia where i live 3 time the bosch one ,so if u have the digram or at least if u know the coloer of the wireing please let me know which one i can replace it with which and thank you
August 6, 2011
  Followup from the Pelican Staff: I would suggest buying a repair manual specific to your vehicle. I don't have much experience with the Australian market. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part. - Nick at Pelican Parts  
juan lepe Comments: I have a BMW, the car have P0240 error with respect to the oxygen sensor, but i do not which I should change. Any recommendations on how to verify that the sensors are ok?
thanks..
July 13, 2011
  Followup from the Pelican Staff: P0240 is a catalyst efficiency fault code. Meaning your catalyst is not functioning normally. - Nick at Pelican Parts  
brian Comments: Why the bonus pictures did'not work??
June 21, 2011
  Followup from the Pelican Staff: Thank you for pointing this out. It is fixed now. - Scott at Pelican Parts  
Dmerk Comments: Hoping to get some help if possible! I have a US-spec 1995 S50 M3, throwing the CEL with a 201 code, which reads Oxygen Sensor Control. Car runs beautifully though, so I'm a little confused as to what the issue is here. I bought 2 O2 sensors, but haven't installed them yet because the more I read the more I think that is not going to fix the CEL. Replaced a cracked air intake boot thinking that might be it, but the code didn't clear. Any suggestions? Any help is greatly appreciated!
June 9, 2011
  Followup from the Pelican Staff: This code could be abad o2 sensor or something creating the o2 to look faulty to the DME. If you repaired a leaky intake boot, I would clear the code and se eif it returns. That may have been your fix. - Nick at Pelican Parts  
BFC1984 Comments: Hi there i have a 2008 318I N46, I have Just had it for its first MOT and the Lambda reading were too high, run a diagnostic check on ECU and also read through the live data and nothing has shown up!!. As a matter of course I have changed Bank 1 pre cat sensor with a new one and the Lambda reading is still high but not as high as before.....
anyone with any ideas please?
May 27, 2011
  Followup from the Pelican Staff: You could have a faulty bank 2 sensor. If the lambda is high, it is possible that it is due to a skewed air fuel ratio sensor.

I'm not sure if the UK uses emission moniors in the DME like we do in the US. If not, this may be why there is no fault code. - Nick at Pelican Parts
 
Scooter Comments: I own a 2000 m44 318ti compact front o2 sensor was showing fault so changed it now no faults showing but fuel consump still very poor and when pulling up at junktions revs take a few seconds to idle correctly.
Any thoughts on problems
May 24, 2011
  Followup from the Pelican Staff: Check the engine for vacuum leaks or a faulty crankcase breather. - Nick at Pelican Parts  
BMW_Guy Comments: Hi , Wayne first off i like that your site his very HELPFULL and RESOURCEFULL on car matter & problems .. My Question is why did BMW change there O2 sensor connection on there 94 95 320i models sedan ,but all others 3 series models like 318 325 328 have the same O2 sensor direct connection fit.?? it has been a issue to fine one that fit and like some help to find one..

happy long weekend
May 22, 2011
  Followup from the Pelican Staff: I would suggest using the right o2 for your model as the wiring pin configuration and connector style changes year to year. - Nick at Pelican Parts  
Lynn Comments: Hi there I recently purchased a 1998 318ti from a used dealership and even though they said they changed the O2 sensor it still shuts off when idle either in park or drive. Do you think perhaps they never changed it? Could it be acid build up around the battery? Because it has that too. Can it be anything more major than that? I know the 318ti 1996 model had transmission problems. Could it be trans. Related? I really need your advice.
May 10, 2011
  Followup from the Pelican Staff: This could be a number of things, however the items you suspect gererally do not cause engine stalling. You could have a faulty cam or crank sensor or a vacuum leak. I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing. - Nick at Pelican Parts  
Jester Comments: Just a bit of advise and a recommendation would be to thoroughly check system for vacuum leaks and fuel leaks as I could smell a strong fuel smell coming from the engine bay, firstly replacing fuel lines, then top end gaskets for the throttle body and intake manifold, then i pulled my injectionion system out and noticed my injectors seals were hardended and cracking so I had them cleaned and overhauled by professionals, after I reinstalled them there was no fuel smell at all, I'm guessing the cracked seals could contribute to a vacuum leak or leaks also at the point of injection. Replaced O2 sensor also and noticed my fuel consumption is down to. still have a slight miss fire. maybe due to valve wear and/or cam wear. more digging to be done.
May 9, 2011
  Followup from the Pelican Staff:
Thanks for the additional information. We appreciate it. - Nick at Pelican Parts
 
Mpmancini Comments: 97 E36 convertible with CE light on, runs fine with good milage. Mechanic has reset many times, says if car is started in the morning when it's cold temperature discrepancy or humidity can cause a miss read of the O2 sensor. What are your thoughts and if true which ones should be replaced?
May 7, 2011
  Followup from the Pelican Staff: if the vehicle continues to set an oxygen sensor code there is likely fault with the sensor it is identifying. I would check sensor operation, be sure it is swithcing and the heater circuit is working. - Nick at Pelican Parts  
dr.e36 Comments: Hi. I have a problem with my 320i M52 '95. The acceleration is uneven. During this, the fuel consumption gauge is swinging up and down by several liters. Any ideas for the cause?I need your help. I have a problem. My e36 320i M52B20 (oct.'95) (275000 kilometers) accelerates unevenly most of the time (about 95%) and during this the fuel consumption gauge sways - rocks up and down evenly about once every second or less for a few liters (metric unit - about two pints) in each direction.
(I am not from an English speaking country so I hope "fuel consumption gauge" is the correct phrase - the thing that shows fuel consumption under the RPM meter).

Of course, the gas pedal is kept perfectly still during this, so the problem isn't due to my leg shaking or anything like that

The previous owner of the car and I studied the problem quite extensively. The phenomenon is not due to any external factor, e.g. wind, road. It happens in all situations. It does not matter whether the car is cold or at the working temperature (although when I have been driving it for 1 hour or so, the acceleration is higher and the fuel consumption much lower, but that is probably normal and due to engine materials being evenly hot and properly dilated)

1. It happens when the gas pedal is depressed from about 1/4 to 3/4 of the way. At low acceleration and at full throttle the acceleration is even, however I think it is not high enough for this engine.
2. The biggest differences in acceleration are seen between 2000 and 4000 RPMs. Above that it is much less pronounced.

Follow this link to see the video, made by the previous owner of the car around 2 years ago:

During this experiment, he held his foot perfectly still on the accelerator. The rocking of the fuel consumption gauge can bee seen above 60 kilometers per hour (above 2000 RPMs, driving in the third gear):
http://tinypic.com/player.php?v=6oh28l&s=5


3. While driving at a steady speed and same gas pedal position (again on a straight road and not on a hill or anything), the car very finely but distinctively accelerates and decelerates, again the consumption gauge mirroring the effect.

This may be important, however it is a recent issue and was not present for almost two years since the problem was first seen: A couple of times when I started the car, one cylinder, I think, didn't work, so the problem could probably be a spark plug, spark plug cable or the top of the thing that divides the current among the spark plugs, right?

This also might be important: Sometimes when I press the pedal, the car doesn't immediately start, but waits and then slowly starts to accelerate.

I don't know if it is related or if it is normal for this engine, but below 3000 RPMs the acceleration is in my opinion very low. Above this barrier, the car is a rocket compared to below it.

I have to ask the previous owner, if he replaced something and after this he noticed the problem or if it couldn't have been related to anything.

- I replaced the rubber hose that connects the airflow meter with whatever is behind it.
- The car didn't show any problems when my mechanic hooked it up on his tester. The spark plugs looked normal and the cylinders didn't show any unusual deviation from normal data.
- The airflow meter was replaced by the previous owner.

My mechanic thinks that the problem could be that somewhere there is air going in through some crack. That would cause the vacuum to drop and would cause the problem in his opinion.

Any comments and ideas will be greatly appreciated! Thank you in advance!

Bye
Thank you!
May 5, 2011
  Followup from the Pelican Staff: I would check your oxygen sensors. be sure they are not stuck or bias in one direction, rich or lean. This would be a good place to start. - Nick at Pelican Parts  
ralliart10 Comments: I got a 318ti 1.9L M44 engine are the two O2 sensors the same or different?
April 27, 2011
  Followup from the Pelican Staff: The oxygen sensors will have different part numbers, the pre cat o2 harness is much shorter than the post. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part. - Nick at Pelican Parts  
Phil056 Comments: I have a 1995 318ic and it has 106k miles on it. I don't believe the O2 sensor has ever been changed recently purchased and noticed my mileage isn't that great. Replaced plugs and cleaned intake, etc.. Did the gas pedal code checking and got 1444. I never have gotten a code, but wanted to know if its a good idea to change the sensor anyway and hope my mileage will increase. Thanks for your great site..
April 22, 2011
  Followup from the Pelican Staff: If the sensor has 100,000 miles on it, replace it. That is the assumed lifetime of the sensor.

See this page for your code: http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm


1444 No more faults This code shows that all faults have been fixed. Required to erase the computer's memory. - Nick at Pelican Parts
 
Rickjames3 Comments: I had error codes P1188 and P1189 I have changed all 4 O2 sensors even though it was just the front 2 and I also had the codes cleared but I am still getting the same error codes. in the last month I have changed the full filter, all 6 coils and plugs. Also on one of the rear O2 sensors had a metal build-up. what else is there to do to get this to clear.
April 19, 2011
  Followup from the Pelican Staff: You could have a vacuum leak or a faulty crankcase breather valve. If there is metal on your o2 sensor, this could be your catalyst coming apart. - Nick at Pelican Parts  
jaymorris318 Comments: hi again wayne, as previously stated i took it to the local mechanic and they had a good look, its been in there 4 days. the fault code purely comes up with 02 sensor and as stated before this did not cure any of the issues : what sort of thing can cause backfiring?? thanks
April 18, 2011
  Followup from the Pelican Staff: Hmm, okay let me think. Backfiring can be caused by:

- running too rich
- running too lean (both can be caused by vacuum leaks)
- low compression in a cylinder
- a coil that is not firing properly
- fouled or bad spark plugs
- Timing is off (can be caused by a faulty sensor)

So, a lot of things can cause it. You need to read the codes to see what the computer is trying to tell you. - Wayne at Pelican Parts
 
ednaearle Comments: I have a 94 530i and have replaced two o2 sensors but the car still cuts off at light if sitting for a short time and sometimes a smell of gas is in the car.... do I need to replace the other two sensors?
April 15, 2011
  Followup from the Pelican Staff: Probably not - that probably is not the problem. A gas smell inside the car means that you probably have a fuel line leak or a seal on your gas tank is leaking. I would check out the article on fuel pump replacement in our tech articles section here and see if the problem is with the seal or the pump. - Wayne at Pelican Parts  
jaymorris318 Comments: Hi i have a 1998, bmw e36 318 UK Model, recently the check engine light came on and it was misfiring slightly, it then backfired and blew the backbox out on the exhaust,i called the local garage and they said fuel must be sitting in the exhaust and hence the backfire, took it in and fault code read o2 sensor and they changed it for a new one. however this did not work and car still mis fires, have had a new backbox and now have a rough idle still, waiting for it to go again and cause more damage, the garage could not explain the fault and advised taking it to bmw which will cost a bomb...... any ideas or advice is greatly taken all other usual routes tried, pipes, sparks, etc thanks
April 15, 2011
  Followup from the Pelican Staff: I would plug it into the code reader and see if you can figure out what the computer is trying to tell you. It doesn't appear that this was an O2 problem (backfiring is not really related to the O2 sensor failures). See my tech article in this section on reading and troubleshooting codes. - Wayne at Pelican Parts  
CHUCK Comments: HI I HAVE A 01 325I IT SMOKES WHITE SMOKE BACKFIRES HAS NO POWER AND GETS VERY LOW MPG ITS BEEN IN THE SHOP FOR A MONTH AND THEY HAVE BEEN UNABLE TO FIND THE PROBLEM PLEASE HELP THANKS CHUCK.
April 6, 2011
  Followup from the Pelican Staff: If a shop has had it for a month and can't figure it out, then it's unlikely that I could assist over the Internet. Sounds like you need to take it to a different shop. - Wayne at Pelican Parts  
DianaNEEDSheLpon BMW Comments: Hi my 2007 328i Bmw SHAKES when i start my car does anyone have any ideas why? I took it to the dealer to get a diagnostic and they told me i need to get my o2 sensor replace and it going to cost me $650. Is this the reason for the shaking the O2 sensor?
March 30, 2011
  Followup from the Pelican Staff: Yikes, that's way too much - you can do it yourself for much cheaper. Although, there are indeed four on the car, perhaps they are trying to get you to replace all of them. As for the car shaking, it shouldn't have anything to do (in my opinion) with the O2 sensor. Could be something else, like a vacuum leak. It could be related to an O2 sensor, but I find it unlikely - most of the time O2 sensor problems make the car run rich or lean, not necessarily shake. - Wayne at Pelican Parts  
shahid Comments: I have a 95 bmw 325i, when i stop a the light and get ready to pull off it is like a 1-2 second delay. sometimes it may backfire. what could that be? Help?

Shahid
March 28, 2011
  Followup from the Pelican Staff: Sounds like it may have some issues with the fuel injection. If you read out the codes, they should be able to point you to a potential problem. I have an article on this here: http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm - Wayne at Pelican Parts  
Paul Comments: O2 sensor light came on and off for several months, causing check eng light / disconnecting battery for a few secs fixed for months then Injector #4 was not working, no current drop coming from DME, car running on 5 cylinders. Turned out to be Bosch Coil failure on cylinder #4!!!!! INSpEcT all you coils very carefully for signs of melting around plastic seals, that was my problem and so easy to fix but even BMW mechanic missed it several times!!!!!
March 26, 2011
  Followup from the Pelican Staff: The DME will shut off injectors if a misfire is detected. Good catch. Thanks for the additional information. We appreciate it. - Nick at Pelican Parts  
Ellie Comments: Hi there - I have 1995 530i and its spent more time with my mechanic than me recently. A couple of things - 1 car will very intermittently not start, lights will come on but car won't even attempt to start. I had a tow truck come out and using his jumper cables, it started just fine. Keeps doing this every couple of days though. 2 sometimes when driving, the engine/coolant level / brake light / oil level sensor lights will come on at different times. 3 when idle for about 20 seconds, the car will start to shake a bit, getting progressively worse then will sound like it's chugging. Once when I pressed on the gas, the car was hesitant to move and then all of a sudden gunned forward. Help??!?
March 17, 2011
  Followup from the Pelican Staff: I had a problem with my 5-Series once where the battery would not function properly, and then it came back, and then it wouldn't work, and then it finally failed. In other words, I would double-check the condition of the battery - sounds like a battery at fault when the car will start with jumper cables attached. - Wayne at Pelican Parts  
decks12 Comments: hi i have a 2005 bmw 1 series 1.6 and the 02 lamda sensor showed up, bank 1 is replaced with a new one but but engine light still on, bank 2 has been checked too,
March 16, 2011
  Followup from the Pelican Staff: The codes that the car gives you should tell you what bank is acting up. I would re-read the codes and see if you can tell which sensor is faulty from them. - Wayne at Pelican Parts  
BMW328IS Comments: I have a 96' 328is and I have an error code "PS0153: Slow circuit response Bank 2 Sensor 1" Which of the four sensors is this particular O2 sensor?
March 12, 2011
  Followup from the Pelican Staff: That's an odd message, I don't think I've seen that one before. Bank 1 is typically associated with cylinder #1, and Bank 2 is typically associated with the 2nd half, which would be 4 thru 6. Sensor 1 would be the one located before the catalytic converter. - Wayne at Pelican Parts  
MaBeamer328 Comments: HOw many oxygen sensors are on a 98 328IS? I'me getting differing information from an after market parts company.
March 7, 2011
  Followup from the Pelican Staff: For the US market, there should be a total of four sensors, and they all appear to have the same part number: 11-78-1-427-884-M209. - Wayne at Pelican Parts  
ChrisInColorado Comments: Hello Wayne, I'm a loyal customer of yours and wanted to run something by you. I have a 97 M3 and recently pulled three CEL codes using my Peake tool. First code indicated fuel injector cylinder 3, 2nd and 3rd codes indicated AfterCat O2 Sensor heater, cyl 4-6 and AfterCat O2 Sensor Voltage, cyl 4-6. I'm going to check the relay for the O2 Sensor. I had read somewhere that the fuel injector code could cause the o2 sensor code, is this possible? Performance of the vehicle seems fine, however I am getting some grey/white some when the car initially fires up, but goes away. Is this related or do I have yet another problem on my hands? Love these cars.

Thanks
March 5, 2011
  Followup from the Pelican Staff: The DME gets feedback from the injectors through the electrical signals from the coils in the injectors. So, a code indicating an injector problem is probably an electrical problem. If an injector is not functioning properly, and then causes the car to run lean or rich, then yes, that might show up as an O2 sensor error. In this case, the sensor would be reading an out of spec condition, which might be a problem with the sensor itself, or a problem with the mixture (directly related to the injectors). You can try swapping injectors around to see if the problem follows the injectors too. - Wayne at Pelican Parts  
cris777 Comments: hi there i have 2002 bmw 325i with the engine light on i when to autozone the codes are po155 02 heater circuit bank 2 sensor 1 and po135 02 heater circuit bank 1 sensor 1 i replace tow o2 in the manifold but when i check in the machine give me a new code p0030 its that normal or the new sensor has a malfunction some vary know exactly the location of this sensors thanks in advance
February 24, 2011
  Followup from the Pelican Staff: The heaters in the O2 sensors are only used to heat the sensor when the car is cold. In general, a failure of the heater circuit will not affect the performance of the car too much - mostly when it's stone cold. The fact that you are getting additional error codes right now is probably not related to the replacement of the O2 sensors, I would guess. P030 is the same code - heater element - I would reset the codes and see if it returns. - Wayne at Pelican Parts  
cris777 Comments: you can tell me exactly were is the location of this sensors and parts # to buy on this page if you can include a pictures in the post would be wonderful thanks in advance
February 22, 2011
  Followup from the Pelican Staff: Check our catalog for the part numbers - it depends upon which car you have, which you didn't indicate here. - Wayne at Pelican Parts  
cris777 Comments: hi there i have 2002 bmw 325i with the engine light on i when to autozone the codes are po155 02 heater circuit bank 2 sensor 1 and po135 02 heater circuit bank 1 sensor 1 they told me i need replace only one sensor is that true? and were is locate this sensor? thanks in advance
February 14, 2011
  Followup from the Pelican Staff: Seems odd that both those codes would come up. The heater circuit on the oxygen sensors is used to heat them up when the car is cold so that you can get accurate readings right away. In all reality, this only affects the performance of the car when it's stone cold, and only for a few minutes too at startup. The codes seem to indicate problems with two sensors, which is unusual. I would reset the codes and see if they come back - having a broken heater circuit in the oxygen sensors is not going to affect the performance of your car very much at all. - Wayne at Pelican Parts  
Beemerfan Comments: I have recently purchased a 97 328i sedan and LOVE it. I am collecting parts to do a spring overhaul and I need to know how may O2 sensors I need. the car has 160K on it and I might as well do them all at once. Can you please let me know how many I need?
February 12, 2011
  Followup from the Pelican Staff: "spring overhaul" - I thought you were talking about shocks and springs! The E36 six cylinder BMWs have four oxygen sensors, one before each catalytic converter on each side of the car. The first oxygen sensor meters the mixture coming out of the engine. The 2nd oxygen sensor is used to measure the effectiveness of the catalytic converter. If you wanted to save money, you might replace the two forward ones, and then leave the two rearward ones alone - if you don't have a check engine lamp, then they are working fine (as all they do is check the proper operation of the cats). - Wayne at Pelican Parts  
donben Comments: bmw 316i 1999 compact 1.9lts is very thirsty, does 20miles to gallon. what could be the possible cause
January 30, 2011
  Followup from the Pelican Staff: The car will typically tell you if there is a problem, check the codes using the tech article I wrote here: http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm If the mixture is off, or an O2 sensor is faulty, the codes should show it.- Wayne at Pelican Parts  
cuddlydave Comments: Hi i have a 316i e36, and the fuel comp has dropped to ten miles to a gall, also noticed a strong smell of petrol in and around the car when first started, but this clears after about 10mins or so, and also noticed black on body work around exhaurst pipe at rear of car. I have checked it from one end of the fuel line to the other for a fuel leak, but there isnt one, any ideas please.
January 21, 2011
  Followup from the Pelican Staff: The car is obviously running very rich. I would make sure that you check the fuel injection error codes to see what the problem might be. You can find out how to do this in my article located here: http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm - Wayne at Pelican Parts  
Ciscokid71 Comments: I just replaced all 4 O2 Sensors on my 96 328i. I cleared the codes & the CEL still came on the next day. It reads E9, CA & CB. How can I fix this problem?
January 11, 2011
  Followup from the Pelican Staff: Which tool is outputting those codes? If it's the Peake tool, the codes are unique to each model car. - Wayne at Pelican Parts  
jonny Comments: my 1996 e36 1.6 was idling erraticly between 1&2rpm for about a month or so now and only 5 days ago it started getting really sluggish when reving and trying to take off and when i managed to take off it was very sluggish this went on for 1 mile then everything was fine until today it happened again but this time it is for longer any advice thanks
December 28, 2010
  Followup from the Pelican Staff: The 1996 cars had On Board Diagnostics Level 2 (OBD-II) built-in so you should be able to read the codes that the car is putting out, and that should give you a clue as to what the issue is. I have an article on this here: http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm - Wayne at Pelican Parts  
kocka Comments: I've got a E36 BMW 318i 1995 model. No oxygen sensors on the exhaust. Is this model suppose to sensors on it?
December 23, 2010
  Followup from the Pelican Staff: On the US-spec cars, they all had O2 sensors. Some of the rest-of-world and Euro cars didn't have them until later. So, it's probably normal that you don't have them. - Wayne at Pelican Parts  
Memo Comments: I have E36, BMW 320i year 95, when the winter appears my car does't estar, only when I put heat means a electric heater in side the motor, berely star again.
star when the temperature is -2 or more.
December 9, 2010
  Followup from the Pelican Staff: I would just guess that it's a major vacuum leak that only shows up when the hoses are cold. When the motor heats up, the hoses expand and fill the gaps. Do a full vacuum leak test on the car and see if you can find the problem there. - Wayne at Pelican Parts  
madchevalier02 Comments: I just had my 06 325 in the shop and they told me that they had to change 2 o2 sensors and that I should replace the other 2. The car is running great, but the check engine light is still on. If 1 or 2 o2 sensors are bad does that mean they are all bad? Is it possible to replace only 1 or 2? Also what is a good estimate of cost of repair? 2 replace 2 they charged me $400 is that a fair cost?
December 4, 2010
  Followup from the Pelican Staff: Yes, you can only replace the sensors that are giving you the error codes. The cost is okay, but it also depends upon which type they are replacing them with. OEM BMW sensors are $80-$100, and the cheaper generic ones can be as little as $20. - Wayne at Pelican Parts  
BTPmom Comments: I purchased my 2001 BMW 330I last year,since then my "check engine" light has been on.Our mechanic has gotten it to turn off, only to have it back on in a couple of days. Now for the past few months when i accelerate from a stop light, my engine dies. It starts back up and may die again. My spouse told me to "drive with 2 feet" but since it's an automatic...I really don't want toburning up gas too much. He drove the car for a week and no problems...of course. But when my 19yr old and 15 yr old ride with me, we have a problem almost everytime. My husband can usually fix anything...but this. I read about the O2 Sensor and the leaks in the intake...DOes this sound like a possiblity?? My marraige-and my sanity need your help!!
November 30, 2010
  Followup from the Pelican Staff: Hi there. It could be one of many things. The car has a set of codes that it triggers when it finds something wrong. 99% of the time when the car stalls, it does so because it has some bad sensor readings (could be a failing component, or a failing sensor). The first step is to read the codes out of the car, and see what it's trying to tell you - what's wrong with it that's causing it to stall. I have a tech article on reading codes here: http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm - Wayne at Pelican Parts  
egmonge Comments: I have an e36 320i, and my gas consumption just went down dramatically, this car is not used much, specially in the last few months, but yesterday I took it for a 50 miles ride, and it used 4.6 gallons of gas, oil is new, so is air filter, no error it was scanned saturday morning.from the computer, any idea? , thanks in advance.
November 22, 2010
  Followup from the Pelican Staff: I would check it against a whole tank of gas - it may be that your gas tank sender is sticking slightly and not giving you accurate ratings. Check it with a full tank and see how far you go, and see if that matches the results put out by the odometer / gas gauge. - Wayne at Pelican Parts  
BMWDAVE Comments: Hi from reading this and trying to deduce how many Oxygen sensors a 1994 325i E36 I believe I have two sensors?
Since my car is OBD-I. Is that correct?
and if so will I just have one pre-catalytic and one post-catalytic Oxygen sensor?
November 17, 2010
  Followup from the Pelican Staff: According to my notes, your car should only have one single oxygen sensor, located in front of the catalytic converter. - Wayne at Pelican Parts  
bob.d.pp Comments: 1994 325is AT O2 sensor just like in your pic #2, http://www.pelicanparts.com/BMW/techarticles/E36-O2_Sensor/pic7.jpg. What specific tool do you use to get in that tight place? The Autozone rental O2 sensor wrench is unable to really fit. Thanks, Bob.
November 6, 2010
  Followup from the Pelican Staff: I think for that photo, I used a large crowfoot wrench. - Wayne at Pelican Parts  
Yupitsme Comments: I have a 94 E36 located the oxygen sensor, got the right wrench, even tried the deep socket wrench and still my 02 sensor will not come undone. I even even put some WD 40 to try and loosen the bolt nut it still won't budge. What can I do?
September 29, 2010
  Followup from the Pelican Staff: It will come out - just use a longer handle. Get a 1/2" breaker bar and an appropriate socket or adapter, and it will snap free. - Wayne at Pelican Parts  
tk881 Comments: Hi. I Change the o2 sensor on my 328i 1996. After it produces alot of white smoke for the first 30min. After that i was driving perfectly. Is this normal?
September 18, 2010
  Followup from the Pelican Staff: There was probably some residual issues relating to the old sensor that had to be "washed" out, perhaps? If all is good now, I wouldn't worry about it. - Wayne at Pelican Parts  
Oundee Comments: I have a 1994 325i and I replaced every thing that I saw wrong with the vechicle so now when i let it idle it would first idle at 700 rpm then afer it warms up it would jump up to 2,000 rpms and then starts to bounce up and down from 1,500 to 2,000 rmps then when i would step on the gas it would rev like theres no power and then when i would shut off the car then try to start the car again it won't start and the hazards would flash and i would smell fuel also flash codes says 1223 HELP
August 29, 2010
  Followup from the Pelican Staff: Check out the code reading article in this section - the error you're getting is a coolant temp sensor code, which probably means this sensor is bad and needs to be replaced. - Wayne at Pelican Parts  
Pat Comments: I would assume these instructions are for the post-cat O2 sensors? My 2003 Z4 fault code says that bank 1 O2 sensor is failed. I take a look at the engine bay and see the sensors, both of them, in front of me. Those are the pre-cat sensors, I assume. However, I want to make sure this is right ... all I need to know is do I really need to jack up my Z4 to get at the pre-cat sensors?
August 2, 2010
  Followup from the Pelican Staff: Yes, the O2 sensors located in the engine compartment are indeed pre-CAT sensors. - Wayne at Pelican Parts  
jax Comments: hi guys
having major probs with my e36 320 tourer....been runnin lovely and all of a sudden it idles like shit!!....changed the oil breather and pipes...checked all plugs and hoses....its lovely when running.just on idle.....seems to run about 600 and sometimes surgies up and down.....any ideas?
August 1, 2010
  Followup from the Pelican Staff: These cars are more than happy to tell you what they think is wrong with them, you just need to be sure that you read the codes. See my tech article for more details: http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm - Wayne at Pelican Parts  
Stevo the devo Comments: On my 328i e36, If i accelerate hard, foot to the floor in first gear from lights, Power keeps cuting in and out, think it may have something to do with air. Doresnt do it in any other gear. If i drive normally and accelerate normally, doesnt do it. Could this be the oxygen sensor of the air intake possibly? all help appreciated
July 29, 2010
  Followup from the Pelican Staff: These cars are more than happy to tell you what they think is wrong with them, you just need to be sure that you read the codes. See my tech article for more details: http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm - Wayne at Pelican Parts  
iCAton Comments: i have a 1993 bmw 325is and my engine seems to be running with Irregular idle but when i press the gas my car goes so slow and doesn't accelerate like it did before, also white smoke is coming out of my muffler and poor gas mileage. What is wrong with my bmw?
July 23, 2010
  Followup from the Pelican Staff: The only real way to diagnose this is by reading out the fault codes in the car: http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm - Wayne at Pelican Parts  
Dominic Nartey Comments: My 1994 318is fuel consumption is high. Idle high at warm what must be the problem and solution.
July 8, 2010
  Followup from the Pelican Staff: You could have a vacuum leak or a faulty crankcase breather valve. I would check both, inspect the engine for a cracked intake boot, vacuum line or leaking gasket. You can also check the crankcase vacuum, this will help you diagnose the crankcase breather valve. - Nick at Pelican Parts  
Brad Comments: The code is P1432 which I think is the Secondary Air Injection System Incorrect Flow Detected.
The Freeze Data is
Engine RPM 1695
Load Value 34.5%
Coolant Temp 132F
Short Term Fuel Trim 1 0.0%
Long Term Fuel Trim 1 0.8%
Short Term Fuel Trim 3 100.6%
Long Term Fuel Trim 3 100.6%
Fuel System 1 CLSD
Fuel System 2 N/A
June 25, 2010
  Followup from the Pelican Staff: Not an oxygen sensor problem then. Sounds like your secondary air injection system might have a broken / cracked air hose. - Wayne at Pelican Parts  
Brad Comments: I have a 1998 323is and the check engine light is on.
What should I look for to determine if this is being caused by the oxygen sesnors. And how many o2 sensors does my car have?
June 24, 2010
  Followup from the Pelican Staff: You need to get the code reader for your car, so that you can pull out the BMW codes which will tell you whether or not this is an O2 sensor problem. An article on doing this is located right here: http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm - Wayne at Pelican Parts  
d Comments: I am replacing my 99 civic exhaust from the cat back and need to drop the cat as the 3 bolts behind the cat are unaccessible. The sensor in the cat will not budge. Can I cut then resolder the wires after the new pipe is attached?
June 16, 2010
  Followup from the Pelican Staff: The sensor is obviously plugged into some other end of the wire harness - simply unplug the sensor wire and then replug it in with the new pip. - Wayne at Pelican Parts  
joferra Comments: Can I use 2 universal Bosch Oxygen sensor anless the original BMW O2 in my European M3 1995 E36?
April 26, 2010
  Followup from the Pelican Staff: They might work, but I've had problems using universal sensors before. The trouble is that the sensors are sealed from unit to the plug (they are submersible), and if you cut the wires to solder on a connector, the sensor may lose it's reference signal. - Wayne at Pelican Parts  
Art Comments: What is the location of Bank 1 Sensor 2 on a 2007 Nissan Altima 2.5S?
April 18, 2010
  Followup from the Pelican Staff: This is the oxygen sensor behind the catalyst closest to cylinder #1. - Nick at Pelican Parts  
Quan Comments: is this a pre cat or post cat sensor change?
April 8, 2010
  Followup from the Pelican Staff: This article covers both pre and post catalyst sensors. - Nick at Pelican Parts  
rob Comments: I have a 97' BMW 318is My check engine light came on last night. I have a computer that I can look-up what did it, but I think it might be the o2 sensor, Do you know how many o2 sensors I have or how many should be change? Do you have any information for me at all? I'm kind of new to this. It's my 1st car. Thanks in advanced!
March 22, 2010
  Followup from the Pelican Staff: You should only change the sensor the fault code points to. I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing an oxygen sensor issue.- Nick at Pelican Parts  
john Comments: hi I have a BMW 320i1995 and have been told i need to change the oxygen sensors 1-3, but was told to just unplug it first...how do i locate the oxygen sensors 1-3 and unplug it...hope you can help. Thanks
March 17, 2010
  Followup from the Pelican Staff: That is the sensor closest to cylinder #1, it should be in the exhaust manifold. Use this tech article as a guide: http://www.pelicanparts.com/bmw/techarticles/E36-O2_Sensor/E36-O2_Sensor.htm - Nick at Pelican Parts  
egi2kas Comments: filled up with petrol and the neadle plunged right down and wouldn't go up. what could it b ? oh its 1997 e36
March 14, 2010
  Followup from the Pelican Staff: You could have a faulty fuel level sending unit. - Nick at Pelican Parts  
bimmerteen Comments: hey i have a e36 323is
and i got these codes P1188
Fuel Control Bank 1 Sensor 1

andP0170 Fuel Trim Malfunction Bank 1
these are o2 sensor codes correct if so
how many do i have?
March 8, 2010
  Followup from the Pelican Staff: Those are fuel trim faults. Indicating a problem with fuel control. You need to check componenets that influence fuel trim.
You could have faulty mass air flow sensor. I would test it using a BMW scan tool.
Also, you could have a vacuum leak or a faulty crankcase breather valve. I would check both, inspect the engine for a cracked intake boot, vacuum line or leaking gasket. You can also check the crankcase vacuum, this will help you diagnose the crankcase breather valve. - Nick at Pelican Parts
 
JC Comments: I have a 1995 BMW M3 03/95 production date and was wondering, how many O2 sensors do I have? I believe just 1 sensor in total which is located pre-cat right?
March 2, 2010
  Followup from the Pelican Staff: If it is US market, you have two. - Nick at Pelican Parts  
Geekling Comments: My car is a 92 325i and my sensor was located in the difficult to reach spot atop the pre-cat pipes. Using the 22mm o2 sensor removal tool on this site made it an incredibly easy job.
February 27, 2010
  Followup from the Pelican Staff: Thanks for the additional information. We appreciate it. - Nick at Pelican Parts  
Online14230 Comments: I have a 1993 E36 316i Right hand drive, South African. Will this tut work for me as well? My car seems to be hunting quite a lot lately, whether cold or hot.
February 12, 2010
  Followup from the Pelican Staff: It might work, give it a try, match the article up to your vehicle. - Nick at Pelican Parts  
dickm33 Comments: How many o2 sensors does my 1999 E36 M3 coupe have, 2 or 4?

thanks in advance
December 18, 2009
  Followup from the Pelican Staff: Your car should have four sensors, two off of the exhaust manifold, and then two more behind the two CATs. - Wayne at Pelican Parts  
e362.0isecrofty Comments: if i replace the o2 sensor, do i need to then hook up to a diagnostic computer for any reason???
December 8, 2009
  Followup from the Pelican Staff: Nope, you shouldn't have to. - Wayne at Pelican Parts  
Peachey Comments: Hey Wayne, My 1998 M3 through a fault code for "bank 2 sensor 1", can you help me find this so I don't pull the wrong sensor. Thanks!
October 14, 2009
  Followup from the Pelican Staff: I don't recall 100% for your E36 which side is correct, but Bank 1 almost always refers to the one that corresponds to cylinder number one (I think that's on the driver's side, but not 100% sure). Sensor 1 is usually the one in front of the CAT. You can also unplug the sensor that you think it might be, and then check the codes again to see if you get any additional O2 sensor codes. In fact, I would probably do this regardless, just to double-check. I think some of the bonus photos in this project might show the mechanism. - Wayne at Pelican Parts  
Alex Comments: Hi, i have a 94 m3 euro spec and when i bought the car there were no pre cat o2 sensors on it and it is running really rich because of it. Also the car seems tentative at low revs but once the vanos kicks in its fine. I am buying the o2 sensors now but do you have any ideas on anything else that could be going wrong??Cheers, Alex
October 1, 2009
  Followup from the Pelican Staff: Sounds a bit messed up. The post-cat sensors simply check the operation of the cats, and are of limited use without the ones in front. I've never heard of a configuration like this, perhaps someone put the sensors behind the cats when they were supposed to be in front? - Wayne at Pelican Parts  
Dex Comments: Hi my Bmw 318is1.9 1998 when i come to idle on traffic lights or on standstill the engine will cut out on me but ill start it back up and then ill drive for a bit then it will cut out while driving but the car will just jerk and then be fine when driving any ideas what this could be many thanks Dex
September 25, 2009
  Followup from the Pelican Staff: Start with the basics - look for vacuum leaks. Usually when a car won't idle well, I've found it's because there are numerous large leaks in the intake that are causing air to escape and give faulty readings to the sensors. - Wayne at Pelican Parts  
rmf917 Comments: I have a 1993 325i and the oxygen sensor is in the "very difficult to reach spot" seen in figure 2. I picked up a set of oxygen sensor replacement tools the deep socket with the slit but still can't get the sensor off; there just isn't room to get the rachet in there.
August 12, 2009
  Followup from the Pelican Staff: Try a crowfoot wrench (Google it for a picture). I have a set and I frequently use them to remove O2 sensors from hard-to-reach spots. - Wayne at Pelican Parts  
Bimmerman Comments: Great info helped a bunch!
August 4, 2009
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help. - Nick at Pelican Parts  
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