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Oxygen Sensor Replacement
 
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Pelican Technical Article:

Oxygen Sensor Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$400 to $600

Talent:

****

Tools:

Oxygen sensor socket, 22mm wrench, flathead screwdriver

Applicable Models:

BMW 323Ci Coupe/Conv (1999-00)
BMW 323i Sedan/Wagon (1999-00)
BMW 325Ci Coupe/Conv (2001-06)
BMW 325i/xi Sedan/Wagon (2001-06)

Parts Required:

Oxygen sensors, anti-seize paste

Hot Tip:

Work with a cool exhaust

Performance Gain:

Remedy fault codes and maintain proper running engine

Complementary Modification:

Install a performance exhaust

Oxygen sensors are used to monitor the oxygen content of the engine exhaust. That information is used by the engine control module to fine tune the amount of fuel supplied to the fuel injectors. In the BMW E46 6-cylinder engine, a pair of oxygen sensors is installed in the exhaust manifolds just ahead of the catalytic converters and another pair is in the pipes just after the converters. 

Once the engine reaches operating temperature, output from the precatalyst pair of sensors settles into a steady wave pattern between 0 and 1 volt. The lower limit indicates a lean fuel mixture (extra oxygen in the exhaust), which the ECM corrects for by increasing the fuel supply. This leads to a richer mixture (low oxygen content in the exhaust) and a higher voltage produced by the oxygen sensor; the ECM then reduces the fuel amount and the cycle continues in this fashion, producing what is called "closed loop" operation.

The post-catalyst pair of oxygen sensors ideally detects a steady and unvarying amount of oxygen exiting the catalytic converters. The ECM uses this information to monitor catalytic converter efficiency.

Oxygen sensors should be replaced every 100,000 miles. In a perfect world that would be it, wait until a specified mileage and replace the sensor. However, these sensors fail prematurely, set off oxygen sensor fault codes and reduce fuel economy. In this article, I will show you how to identify the location of all four oxygen sensors and how to replace them. You will need an oxygen sensor socket to remove the sensors. Remember to always work with a cool exhaust. Oxygen sensors are fragile. Do not drop one or damage may occur. Also, keep the sensor tip clean when reinstalling.

Oxygen sensors are laid out in banks, which refer to cylinders and in sensor numbers referring to before or after the catalytic converter. Bank 1 or B1 refers to cylinders 1-3. Bank 2 or B2 refers to cylinders 4-6. Sensor 1 or S1 refers to the sensor before the catalytic converter. Sensor 2 or S2 refers to the sensor after the catalytic converter.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches. 

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you are working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability. 

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Replacing the sensors before catalytic converter

Remove the engine covers. See our Pelican Parts Technical Article on Removing Your Engine Covers. Oxygen sensors are located in exhaust manifold.

Bank 1 Sensor 1, green arrow.
Figure 1

Bank 1 Sensor 1, green arrow. Bank 2 Sensor 1, purple arrow

Bank 1 Sensor 2, green arrow.
Figure 2

Bank 1 Sensor 2, green arrow. Bank 2 Sensor 2, purple arrow

Locate the oxygen sensor electrical connectors at the right side of engine above exhaust manifold (green arrows).
Figure 3

Locate the oxygen sensor electrical connectors at the right side of the engine above the exhaust manifold (green arrows). Label or mark the connectors to help during the reinstallation process. I suggest replacing one sensor at a time so you do not mix up the connectors.

Next, disconnect electrical connector (of oxygen sensor you are replacing) by pulling it apart.
Figure 4

Next, disconnect electrical connector (of oxygen sensor you are replacing) by pulling it apart. Then detach the wiring harness from the mounting clips by pulling it out.

Using an oxygen sensor socket, remove the oxygen sensor from the exhaust manifold.
Figure 5

Using an oxygen sensor socket, remove the oxygen sensor from the exhaust manifold. Lightly coat new oxygen sensor thread with anti-seize compound. Install the new oxygen sensor and torque to specs. Then reroute the wiring harness and connect the electrical connector. Repeat if replacing both sensors. Then reassemble the engine covers and clear any engine fault codes using a BMW scan tool.

Replacing sensors after catalytic converter.

The oxygen sensors are located in the exhaust, behind the catalytic converters.

Locate the oxygen sensor electrical connectors on top of the engine near the fuel rail (green arrows).
Figure 6

Locate the oxygen sensor electrical connectors on top of the engine near the fuel rail (green arrows). Label or mark connectors to help during the reinstallation process. I suggest replacing one sensor at a time so you do not mix up connectors.

Next, disconnect the electrical connector of the oxygen sensor you are replacing.
Figure 7

Next, disconnect the electrical connector of the oxygen sensor you are replacing. Then detach the wiring harness from the mounting clips by pulling it out.

Using an oxygen sensor socket, remove the oxygen sensor from the exhaust manifold.
Figure 8

Using an oxygen sensor socket, remove the oxygen sensor from the exhaust manifold. Lightly coat the new oxygen sensor thread with anti-seize compound. Install new oxygen sensor and torque to specs. Then reroute the wiring harness and connect the electrical connector. Repeat if replacing both sensors. Then reassemble the engine covers and clear any engine fault codes using a BMW scan tool.

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Comments and Suggestions:
Dan Comments: 2001 BMW 330i with 98,000 miles, getting codes p1083, p1085, p0171, and p0174. Change MAF sensor and no change, is problem most likely bad O2 sensors and if so which ones, thanks
November 8, 2016
  Followup from the Pelican Staff: If both banks are lean, look for something that would affect both. Fuel delivery, vacuum leak, faulty crankcase breather. - Nick at Pelican Parts  
tonylee4327 Comments: My 2006 X5 3.0 gave the code p1093 if I drove around 70 to 75 mph for 300 miles on I95. Sometimes the CES light went off then came back on again on the trip from VA to FL. The SAV has 75K miles on it and is it an O2 sensor issue or something else ? I had an average of 22 mpg on highway.Thanks
October 14, 2016
  Followup from the Pelican Staff: The fault code is for fuel trim. You will have to look at the fuel trim on both banks and see which direction it is skewed. Could be vacuum leak of faulty maf sensor. - Nick at Pelican Parts  
robertdoing Comments: My 325i has service engine light. I used the Peak Research R5 reader and pull these codes: c28F3, c2882, and c2883. Looking up the manual, they are: O2 sensor trim control bank 2, Mixture preparation bank 1, and Mixture preparation bank 2. Where should I start? thanks
September 25, 2016
  Followup from the Pelican Staff: You have fuel trim faults on both banks. This means you need to look for a cause that affects both banks. Look for vacuum leaks, fuel delivery or a faulty mass air flow sensor. - Nick at Pelican Parts  
Howard Comments: We replaced the pre catalytic 02 sensors in our 2000 323i. After driving over 300mi no check engine light but cannot pass smog. Did we miss a step or does the system needs to b reset
September 24, 2016
  Followup from the Pelican Staff: What is preventing it from passing smog? - Nick at Pelican Parts  
peter Comments: Hi Code p2237 replace o2 sensor with OEM and 10 days later same code came up with car slightly jerking on highway speeds..like before
please help
September 22, 2016
  Followup from the Pelican Staff: The wiring may be damaged or you replaced the wrong sensor. that is for bank 1 sensor. - Nick at Pelican Parts  
Tyler Comments: i have a 2000 323ci with a p0303 cylinder 3 misfire and a p1182 o2 sensor B1S2 open circuit during coast down fuel cut-off. what does this mean? should i just replace the o2 sensor?
September 21, 2016
  Followup from the Pelican Staff: The o2 snsor is likely faulty.

Also sounds like an engine misfire. I would check spark, fuel and compression on all cylinders. - Nick at Pelican Parts
 
g Comments: I have bmw e46 320I bank 2 sensor 2 in the same exhaust side as bank 1 sensor 2
September 6, 2016
  Followup from the Pelican Staff: No. It is after the cat on the rear cylinders. - Nick at Pelican Parts  
frenchy Comments: how many o2 sensor on a 325xi AWD
September 3, 2016
  Followup from the Pelican Staff: 4 - Nick at Pelican Parts  
matfel Comments: Help , I have a CEL for a bmw 323ci 2000, which tells me oxygen sensor , bank 1 , sensor 1 has problem with low voltage in the heater circuit.
I have replaced the sensor twice with no success,
I brought the car to the dealer who told me that I needed a new DME, but they could not guarantee that that would fix the problem.
I bought a used DME for the same model and get the same error code.there is low voltage at the sensor side and the wires from the DME have low voltage as well
The car runs fine, but cant pass inspection , have not been able to drive the car for more than a year.
what can i do?
September 3, 2016
  Followup from the Pelican Staff: The heater circuit for the o2 sensor is the issue. Either the wiring or the DME. Start by testing the good sensor heater to get a starting point for voltage. Then compare those tests to the sensor with the fault. If you find part of the circuit is missing, run new wires to the dme. Does that fix it? - Nick at Pelican Parts  
carlm13 Comments: i have code po2240 positive control open circuit - tried TWO new sensors and the same code - i suspect a wiring issue so where does the harness that plugs into the O2 sensor go? it disapears behind the engine and seems to go trhrough the firewall, where is the other end of it go so i can trace the wire and find the break? - does it go to the DME box in the engine bay or somewhere else?
July 19, 2016
  Followup from the Pelican Staff: Your fault code has too many digits. Can you double check it? - Nick at Pelican Parts  
NigzWigz Comments: I have a 04 316i EU BMW with a code P0040 "upstream oxygen sensors swapped from bank to bank". What is meant by upstream??
July 8, 2016
  Followup from the Pelican Staff: The sensors before the catalyst. - Nick at Pelican Parts  
Bill Comments: Hey, I am throwing a code p1152 O2 Sensor Heater Circuit Low Voltage Bank 2 Sensor 1 in a 2001 325ci. I just cleaned my MAF but it didn't seem to be the problem. Does this usually just call for a new sensor or is it something else? Thank you
June 17, 2016
  Followup from the Pelican Staff: Heater faults are usually faulty sensors.

Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Kevin Comments: an update on my rough idle issue. After replacing both O2 sensors and one or two driving cycles, the O2 sensor's voltages were cycling normally and both fuel systems were staying in closed loop. No misfires at idle!
May 24, 2016
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
 
MJ Comments: Help! I have a 2001 E53 3.0 with a weird O2 Sensor issue. My software reads "O2 Sensor controller Bank 1 1.07%" & "O2 Sensor controller Bank 1 4.22%" but the live readout for the actual sensors all say "99%"! They could not have all gone bad simultaneously, right? Help!!!
May 22, 2016
  Followup from the Pelican Staff: the 99% you are seeing is the heater controller. The other codes are for fuel control faults. You will have to drive the vehicle and record the data. Then review it to see when the fuel trim is skewed. - Nick at Pelican Parts  
Kevin Comments: Need help with a 2002 325Ci. I have an issue where after driving for a while warmed and then idling at a stop light or something, the engine sometimes begins to misfire badly on multiple cylinders P0300, P1343, P1345, P1347 misfire with fuel cut off on #1,2,3. If I turn engine off/on the problem goes away for a while. If I rev 1000 at idle the problem never occurs. I had noticed oscillating voltage on O2 B2S1 so I replaced that one. I now understand that this normal operation. My question is on O2 B1S1 the voltage changes a bit when driving but otherwise hangs around 0.3V steady. Could this be a half-dead sensor causing my rough idle? Also Fuel System 1 stays OL-Fault while Fuel System 2 goes CL. Or should I check something else?
May 18, 2016
  Followup from the Pelican Staff: The sensor may be stuck from the engine misfire, especially stuck low. I would address the misfire first.
I would check spark, fuel and compression on all cylinders.
- Nick at Pelican Parts
 
Bimmerdude Comments: Where Bank 2 sensor 2 on a 1998 328i?
May 16, 2016
  Followup from the Pelican Staff: See figure 2. it is in a similar location. - Nick at Pelican Parts  
Dugzy Comments: Hey nick. I am getting a fault code on e46 325i.it reads; bank1, sensor1 not active. I replaced with a new "bosh" and it gives the same reading. Could it be a fuse? If yes, can you please tell me where I can locate it. Thanks in advance.
April 18, 2016
  Followup from the Pelican Staff:
The sensor wiring to the DME may be faulty. That code is for the signal, no fuse used for a single signal. You will have to test the signal at the DME. Start by monitoring both pre-cat o2s using a BMW scan tool.

I don't have the wiring or fuse info for your vehicle. I would grab a repair manual. It will have it.
Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
samKO Comments: Hi,
I have a 2004 330ci. Recently, I got a code that says DTC: '28F3 Oxygen sensor, bank2: trim control'
Does that mean bank2 post cat o2 sensor is faulty?
April 18, 2016
  Followup from the Pelican Staff: Yes. Or an exhaust leak. Check fuel trim and sensor function first. - Nick at Pelican Parts  
aguido Comments: Hello,
I have an '04 M3, code is P0139/BMW-FC 92 - 02 Sensor Circuit Slow Response Bank 1 Sensor 2. Should I start by replacing 02 Sensor? And can you refer me to a DIY link?

Thank you in advance
April 2, 2016
  Followup from the Pelican Staff: Yes, that code is likely caused by a faulty o2 sensor. We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Bassam Barham Comments: hi , first i want to say what a great web site and very useful and thanks for sharing your experience, i have bmw 318i 2004 and i have the following codes P0050,P0056,P0160 and all these codes lead to HO2S Heater & O2 Sensor , and my car always in limp mode and have shifting issue, can this codes occur fail in the Transmission Gear? and do you advise to change the sensors?
Thanks in advance
March 25, 2016
  Followup from the Pelican Staff: No, the o2 sensor faults will not cause shifting issues.

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
 
dan Comments: I have a 95 318i and im getting the code 1221 I just need to know which oxygen sensor that is. pre-cat or post-cat
March 12, 2016
  Followup from the Pelican Staff: pre-cat, is I remember correctly. Be sure your exhaust is sealed and fuel control is normal. - Nick at Pelican Parts  
patronteq Comments: My bmw 323i is acting odd. Only the first three chambers are misfiring. It has new coils and the fuel system has been cleaned. Needless to say I have no power as its basically running as a 3 cylinder.
February 25, 2016
  Followup from the Pelican Staff: You will need to determine what is missing from the cylinders. Spark, fuel or compression. - Nick at Pelican Parts  
NurLinks Comments: Thanks so much for your articles. Replaced the exhaust manifolds on my '02 325i. The after catalyst sensor where a pain to remove.... We had to cut the exhaust and use some serious force. Now I get the following codes:

3D/74 - Oxygen sensor heater after catalyst, bank 2, open circuit
BE/78 - Insufficient heat output, oxygen sensor after catalyst, bank 1, sensor heater faulty
98/B4 - Oxygen sensor voltage after catalyst, bank 1, open circuit

I guess I have damaged them during the removal, or could something else be the issue?
January 25, 2016
  Followup from the Pelican Staff: most likely damaged. Check if the sensor heaters have power. If so, they are likely faulty. - Nick at Pelican Parts  
Rliver Comments: Hi, I have an E46 320I 2003.
With BMW Scanner 1.4.0 I find this see the photo.

What do you think ? I need to remplace the sensor or I have an over problem ?
December 9, 2015
  Followup from the Pelican Staff: Looks like a faulty o2 heater with all the codes. Test the heater circuit to be sure. Most likely the sensor. - Nick at Pelican Parts  
Ben Comments: I have an e46 2001 325i. The heated O2 sensor status monitor will not register as complete. I really need to get my car smogged and it has been over a month. This is the only monitor left that has not run. Any ideas as to what the problem might be? Also, when is this monitor supposed to be completed? At cold start idle? Thank you for your time.
November 22, 2015
  Followup from the Pelican Staff: Could be the vehicle is warming up too slowly due to a fault thermostat. - Nick at Pelican Parts  
chrismac Comments: I recently did a engine swap and I followed all the instructions for o2 replacement . I have a 2000 328i and I checked with the scan tool and I have voltage all consistent, and not one heater works on all my o2 sensors via scan tool and the codes it threw. All my o2 heaters failed at once!



I checked my heater to the o2 via two white wires which read 2.4ohms. I checked my fuse pack and my 30a fuse for o2 heater was fine. Earlier I said 20a which was wrong could my fuse holder be messed up ? And my plugins to connect o2 sensors how would I test them? Could they be damaged somehow?



I'm out of options and so is my mechanic. Need a gurus help. Even Replaced all the o2 s with working brand new one while testing each to check them. Ughhhhh
November 3, 2015
  Followup from the Pelican Staff: If fuse 4, 30 amp has good power. hold steady when loaded, the issue may at the control side. However, if more than o2 is a problem, then the issue is likely in the wiring.

Pick one sensor, check if the connector has power on each side for the heater. If so, follow the wire to the DME and check if the wire has power at the DME.- Nick at Pelican Parts
 
dro Comments: Hey is the bank 1 sensor 1 upstream or downstream ?
September 23, 2015
  Followup from the Pelican Staff: It is the sensor before the cat, closest to cylinder 1. - Nick at Pelican Parts  
LFJ Comments: The bank 2 downstream sensor looks like it is impossible to get to with that wrench. Some report that it is really difficult to reach. Do you have any tips or tricks?
September 21, 2015
  Followup from the Pelican Staff: PLACE THE WRENCH ON THE SENSOR FIRST, THEN ATTACH A LONG EXTENSION. use a universal adapter if needed. - Nick at Pelican Parts  
Kman325i Comments: This DIY is helpful in all, BUT, how do you get bank 2 sensor 2 out? I have tried so far with no luck. Any tips?
September 16, 2015
  Followup from the Pelican Staff: You'll need to use a o2 socket as shown, or go from the top with a long extension. Once free, unscrew it. - Nick at Pelican Parts  
Nate Comments: Z4M with S54.

If I go full throttle, regardless of the RPM I'm at, I get a little hesitation for .5 seconds, then it seems to clear itself and accelerate normally. During the hesitation, it almost sounds like it is bogged down and there is an audible change when it picks up it sounds happier.

Here are are the codes it is throwing. If I clear them, they all come back. The first code won't clear, so I suspect there is an actual failure, but I can't imagine it would be causing this issue.

// 1 2E7C bit serial data interface, signal BSD wire failure
// 2 2C92 EGT sensor, electric
// 3 2C9C Output heater 02-sensor before catalyst
// 4 2C9D Output heater 02-sensor before catalyst bank 2
// 5 2C9E Control heater sensor after cat
// 6 2C9F Control heater sensor after cat bank 2
September 13, 2015
  Followup from the Pelican Staff: I would repair the issue with the bank 2 o2 sensors first. Once repaired, you can confirm fuel control is normal. Then diagnose if the issue is still present. - Nick at Pelican Parts  
Ish Comments: Hey guys, My car threw a couple codes P0136, P0340, P0141, P1182 & P1186 all leading to Bank 1 Sensor 2. Should I only replace this sensor in Figure 2, or should I replace B2 S2 as well? Thanks in advanced
August 3, 2015
  Followup from the Pelican Staff: Start with B1S2 to get the light out. You may not have to replace both.

However, most times if one is going bad and they are they same age, the others will fail shortly after. - Nick at Pelican Parts
 
eascoastpirate Comments: I solved the problem of the check engine light it was the petrol cap not sealed right took it off put it back on light went off result
June 19, 2015
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
 
solara Comments: When connected to my Scantools OBD sensor, in Mode 5 I only get data for Sensor 1 Banks 1 and 2. No Sensor 2 data. I can see Sensor 2 data in the PID and the voltage does change mostly steady since Sensor 2 is post-cat. Despite changing all 4 O2 sensors, my O2 sensor status still does not complete and I can't get it smogged checked. Should Mode 5 be showing my Sensor 2 data along with the Sensor 1, or is that normal BMW 323 2000. And any other ideas as to why the O2 sensor status does not complete? I've reset the error codes and ran several drive cycles - all other monitors are complete, including the EVAP which tends to be the last one to complete!
June 19, 2015
  Followup from the Pelican Staff: Mode 5 are the monitors, you will not see fluctuation there. You will need to look at live data to see sensor fluctuation.

I would assume there is an underlying problem, like the engine not reaching operating temp fast enough or DME software. - Nick at Pelican Parts
 
eastcoastpirate Comments: got a 323ci se had the traction control light eml light and engine light come on and had the rough idle and limp mode I removed the icv and throttle body cleaned throttle body and icv with throttle body cleaner and discovered a perished pipe behind the throttle body replaced perised pipe replaced both throttle body boots and the eml and tc light rough idle and limp mode have gone but engine light still on any ideas
June 18, 2015
  Followup from the Pelican Staff: What is the fault code? - Nick at Pelican Parts  
WC Comments: Thanks for the great forum. I've ordered parts before and now want a job at pelican!
Anyway here goes.
2001 325i, starts chugging and vacumn guage drops till it rebounds. Sometimes just dies. Pulled codes and they all lean toward low fuel in one cylinder or another. Changed fuel filter 15K ago. Car has 208K great running miles on it. Sound like I should start with the fuel filter first? Last night it ran fine 60 miles back home without a missfire. Thanks, WC
June 6, 2015
  Followup from the Pelican Staff: A single cylinder problem would not cause a stall. 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
 
Dan Comments: Rxpeirce, I am currently having a similar problem with my 2000 BMW 323i. My car is experiencing the same symptoms, rev limiting, Traction Control light, Service Engine Soon, and the EML lights all came on. I was told by my Mechanic that it was because the throttle body failed and is stuck closed. The part costs between $500-$650 and, depending on your mechanic, should cost around $1000 out the door.
May 31, 2015
  Followup from the Pelican Staff: Thanks for the input on this one. We appreciate the help.
- Nick at Pelican Parts
 
325i rxpearce Comments: 325i 2000 won't let rpms go over 2000 eml light is on traction conto light won't go out but idles fine wht wrong w with my car plz email me rxpearce@gmail.com
May 31, 2015
  Followup from the Pelican Staff: EML light is usually an issue with the throttle housing.

You can run a test using a BMW scan tool. Replace the throttle housing if you find it setting a fault. - Nick at Pelican Parts
 
2000,325 I rxpearce Comments: My 325i won't shit over 2grand and traction conto light won't go off and the eml light is on and the computer u to it says fuel system bank one sensor1 so plz help me with what wrong with this
May 31, 2015
  Followup from the Pelican Staff: EML light is usually an issue with the throttle housing. - Nick at Pelican Parts  
Emteck Comments: Dimitri, if you handbrake light, ABS and Triangle warning lights are on, on dash even with engine on then it will be your ABS sensor on left wheel. You can get them from Pelican PArts, make sure you get right one, taking old one off will break, I used drill to drill 2 wholes on the plastic part of old sensor, and wedged it out with screw driver and long tip pliers. There are 4 ABS sensors, 2 front L/Rlonger sensor tip, 2 rear L/Rshorter sensor tip. They are located on the arm of each wheel.
May 1, 2015
  Followup from the Pelican Staff: Thanks for the input on this one. We appreciate the help.
- Nick at Pelican Parts
 
Dimitri Comments: Sounds to confuse dont understand.I don't have any lights or faults cus car is been on diagnostic and only show abs front left faulty and something about precharging pump.don't no what else to do.
April 30, 2015
  Followup from the Pelican Staff: You may need to seek a shop's assistance.

the codes you have are for the ABS/ DSC system. They will not be related to a fuel consumption issue. - Nick at Pelican Parts
 
Dimitri Comments: Hi nic what do u mean trim numbers and where are they ? My mechanic said didn't show any faults on sensors.he only found this 33 wheel speed sensor front left circuit ,23 incorrect coding ,88 precharging pump that what he said to me.what's all this? My abs light and traction control light is on.
April 29, 2015
  Followup from the Pelican Staff: Fuel trim is the fuel control of the vehicle. They will indicate if the engine is running lean or rich. - Nick at Pelican Parts  
Dimitri Comments: Gof the BMW 5.20i se 2001 and is using more petrol than normal.if I change the o2 sensors is that going to make it better or could be other the problem.
April 27, 2015
  Followup from the Pelican Staff: I would think not, unless you have o2 sensor fault codes. What are you fuel trim numbers? - Nick at Pelican Parts  
Nour Comments: Thank you Nick very much for your considerate.
Other symptoms are:
There is spark.
There is fuel coming however I could not measure the pressure or discharge volume yet.
The fuel tank is full.
Injectors seem fine.

here are some error codes :
code 11 - Thermal oil level
code BF - Internal fault instrument cluster
code IC - Auc sensor
code IE - Auc heating.

Do you really think that fuel quality prevent the engine from starting at all even for seconds? and can I check the engine compression on a cold engine?

Any further advise please.
Thank you in advance.
April 20, 2015
  Followup from the Pelican Staff: Bad fuel can cause a no start.

Compression can be checked when the engine is cold. - Nick at Pelican Parts
 
Nour Comments: I just bought a 2001/2002 325i E46 102 miles on the clock,it was empty so I fill it up with 91 Octane fuel. I changed the Oil and oil filter, ran it for 20 min the it stopped/stalled and never start again, it revs but no start. I was wondering is the reason can be any of the 4 O2 sensor or shall I search some other causes? Some people say most likely it is the fuel pump.
Please some advice.
I
April 19, 2015
  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 fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
Jason Comments: Hi. I have 2002 X5. I need to replace sensors after catalytic converter. Do I have to remove front end reinforcement plate to reach the sensors? Are the sensors located in the passenger side or driver side? Thank you.
April 17, 2015
  Followup from the Pelican Staff: See this tech article:

http://www.pelicanparts.com/techarticles/BMW-X5/84-EXHAUST-8_Cylinder_Engine_Oxygen_Sensor_Replacement/84-EXHAUST-8_Cylinder_Engine_Oxygen_Sensor_Replacement.htm - Nick at Pelican Parts
 
ryu Comments: I took my car to smog and the smog computer indication said it was my oxygen heat sensor . which sensor should I change ? 2005 BMW 325ci
March 24, 2015
  Followup from the Pelican Staff: I would need to know the fault code number and the last seven of your vin to identify the sensor. - Nick at Pelican Parts  
Demos Comments: I have a 2001 BMW 330ci and one of my codes is P0141 O2 Sensor Heater Circuit Bank 1 Sensor2. My questions are .... can I change them on my own? Where is it located? Do i need to lift up my car?
March 17, 2015
  Followup from the Pelican Staff: You can change the oxygen sensors yourself. The article you commented on shows the location and how to replace them for your model. http://www.pelicanparts.com/BMW/techarticles/BMW-3-Series-E46/26-FUEL-Oxygen_Sensor_Replacement/26-FUEL-Oxygen_Sensor_Replacement.htm - Nick at Pelican Parts  
Bigchris1985 Comments: I have a 325ci 2001. Starts fine but after 30 mins of driving and I park and leave it to cool down, she's a pig to start up again then she runs rough and stalls after breaking around 5 times, after that she starts and drives fine again. Had crank and camshaft faults come up as well as 02 after cat fault,
Changed crank sensor and reset faults but all come back on again, even the part I changed. Any ideas ? It's driving me crazy
February 25, 2015
  Followup from the Pelican Staff: Could be many things. 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 fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
Chaz Comments: I have a 2001 530i I need to know if both of the oxygen sensors located after that cat are considered Downstream and the same before cat are those suppose to be upstream
February 23, 2015
  Followup from the Pelican Staff: The are called pre and post catalyst. Which could be switched for upstrem and downstream. See this tech article:

http://www.pelicanparts.com/BMW/techarticles/BMW-5-Series-E39/89-EXHAUST-Oxygen_Sensor_Replacement/89-EXHAUST-Oxygen_Sensor_Replacement.htm - Nick at Pelican Parts
 
epj Comments: Thanks nick i will call
February 22, 2015
  Followup from the Pelican Staff: No problem. - Nick at Pelican Parts  
Lance Comments: Thanks for all of your write ups. Very helpful. My 2001 bmw 330xi is giving me a p1151 code. Oreilly's said that is an 02 Sensor Heater Circuit Intermittent Bank 2 Sensor 1 code. Should I just look at switching out the o2 sensor or looking elsewhere first. Thanks, Lance
February 20, 2015
  Followup from the Pelican Staff: You should check voltage to the heater before replacing it. However, if only one sensor is setting the code, it is likely the sensor. - Nick at Pelican Parts  
epj Comments: My sensors were not bad. Bank2 wire were burn i splice them but i think i burn something else because there is fault on the communiction link and the question is how can check the voltage on the sensor wire or if there is a fuse that could it got burn and where are they in the car
February 17, 2015
  Followup from the Pelican Staff: The burned wires, if shorted would have blown fuses. You will need a wiring diagram for your vehicle. I would grab a repair manual. It will have the diagram and fuse locations.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
epj Comments: Bank2 sensor wire were burn and don't know if the sensors went out and also the control board. All of the four wire got touch. The other question does the control board has a fuse to prevent the board to burn
February 15, 2015
  Followup from the Pelican Staff: I replied to your other question. - Nick at Pelican Parts  
epj Comments: Hey I have bmw and bank2 o2 sensor wire got burn out now I get code p0600,p00031,p00037,p0051 can tell me what to do
February 15, 2015
  Followup from the Pelican Staff: Those are heater circuit codes. Start by checking the fuses. The o2 heater fuse is likely blown from the shorted wires. - Nick at Pelican Parts  
doc319 Comments: sorry it is a 2002 325i
January 30, 2015
  Followup from the Pelican Staff: OK. got it. - Nick at Pelican Parts  
doc319 Comments: Will the o2 sensors cause the car to shut off when stopping at a light?
January 30, 2015
  Followup from the Pelican Staff: No. But a fuel pump, cam or crank sensor failure may. - Nick at Pelican Parts  
Pedro Comments: Ive got a 325ci 2001 bmw.there are 2 lambda sensors. 1 on the side of the engine, the other somewhere near the catylisater.Trouble is im not a mechanic, and cant find any info regarding location etc of second sensor. Can you help??
January 16, 2015
  Followup from the Pelican Staff: The article you commented on describes the locations of all the sensors on E46 models. http://www.pelicanparts.com/BMW/techarticles/BMW-3-Series-E46/26-FUEL-Oxygen_Sensor_Replacement/26-FUEL-Oxygen_Sensor_Replacement.htm - Nick at Pelican Parts  
Tony Comments: Hi Nick, 2002 BMW 318i e46 m42 engine. the O2 sensors appear to have their own plugs next to the sensor, this does not correlate with any of the pics or write ups. I am new to all things BMW and any assistance / advice would be appreciated. Error codes P0036; P0140 and P1169
December 21, 2014
  Followup from the Pelican Staff: We don't have that model in the US. Are you looking on how to replace them? Should be similar, remove that reinforcement plate for better access. Then mark the connectors so you don't mix them up later. Remove the sensors and install the new ones. - Nick at Pelican Parts  
scurtin3 Comments: To change the post cat sensors on an e46, will I need to put the car on jacks?
November 26, 2014
  Followup from the Pelican Staff: Yes, you will. - Nick at Pelican Parts  
Matt Comments: Is it possible to change just the connector? Isn't it hard wired to the DME?
November 13, 2014
  Followup from the Pelican Staff: Sure, you can get repair terminals and wires. Then crimp and heat shrink them. - Nick at Pelican Parts  
Matt Comments: Voltage checks good. Very frustrating.
November 12, 2014
  Followup from the Pelican Staff: If voltage tests good. loaded, and the circuit to the DME is OK, you have a defective sensor or connector. - Nick at Pelican Parts  
Matt Comments: Getting p0036 code. When I swap the bank 1 and bank 2 sensors the code does not follow. When I swap the connectors however I get a p0056 code. This tells me it's not the sensor. Any ideas?
November 11, 2014
  Followup from the Pelican Staff: Swapping connectors is not a good idea with oxygen sensors. I would check the voltage going to the heater circuit, you may have a bad wire. - Nick at Pelican Parts  
warren Comments: I am receiving a catalyst efficiency code for bank 2. Is this the rear sensor or is it the converter, how can you tell?
October 9, 2014
  Followup from the Pelican Staff: By monitoring oxygen sensor operation and switch rate between the front and back sensors. You would need a labscope for this test.

Most times, if there is no oxygen sensor fault code, the catalyst is at fault.- Nick at Pelican Parts
 
Nicoya 1986 Comments: Body I have a code p 1189 and p 1188 what sensor is that is pre cat sensor or ?
September 3, 2014
  Followup from the Pelican Staff: Those codes are for both pre-catalyst oxygen sensors, relating the fuel trim. Check the fuel trim of your vehicle. Start by confirming the oxygen sensors are working, then monitor fuel trim to see how it is skewed. - Nick at Pelican Parts  
john John Comments: Are all 4 sensors the same type or different? If different which types do I need?
August 31, 2014
  Followup from the Pelican Staff: You didn't mention what vehicle you have. Usually they are all different, even if just the wiring. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
Altimized Comments: Hi I hope one of you guys can figure out what problem im having with my 04 BMW 325i sports wagon. Whenever I accelerate way past 5rpm or if I just suddenly floor it my car would die out or like what other people are saying it goes into "Limp Mode". When it does that I get "EML", "DSC", and "Brake" lights to come on the dash and I cant do anything unless I shut down the engine and then start it up again then everything is back to normal. I had error codes checked and they are "P0133, P0174, and P0171". Does that have to do with my vehicle acting like that?
August 8, 2014
  Followup from the Pelican Staff: The fault codes are for fuel mixture control at limit.

I would start by checking the fuel trim on your vehicle, see where and at what engine range it is faulty. This will help when trying to diagnose.

I would then check the operation of the throttle housing, as the EML light sometimes ends up being a faulty one. - Nick at Pelican Parts
 
VEGAS562 Comments: 2005 BMW 325I CODE 173 174 430 WHAT IS THE COSE
July 2, 2014
  Followup from the Pelican Staff: I would need the P-code to be sure. But they codes look like fuel trim faults and catalyst efficiency. - Nick at Pelican Parts  
Clazza Comments: I need all 4 four sensors for my 02 325ci Msport, what are the part numbers I need
May 16, 2014
  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
 
rinkedink Comments: Can you tell me how the tab added up to ~$200? If you buy the sensors from Pelican parts, each one is well over $100.00 for a tab of more like $500 - $600. Am I missing something? How can I do this job as cheaply as possible?
February 3, 2014
  Followup from the Pelican Staff: It may be related to replacing one at a time, or a pair. I will have someone look into the pricing. - Nick at Pelican Parts  
Burton Comments: Are both precat oxygen sensors the same?
November 15, 2013
  Followup from the Pelican Staff: Yes they are. - Nick at Pelican Parts  
Syed Jamil Comments: Great information.
October 28, 2013
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
gs400 Comments: Hi, I just replaced all 4 O2 sensors on my 04 325 XI and I noticed they were set up to plug into each other, one pre cat sensor plugs into one post cat sensor plug. Is this correct? I can't seem to find any other harness connections for them.
October 22, 2013
  Followup from the Pelican Staff: The sensors do not plug into each other. They plug into the engine electrical harness. For example the plugs for the pre-cat o2s should be at the fuel rail or near the exhaust manifold. - Nick at Pelican Parts  
Eltelturbo Comments: Hi,I need to do this on my 2004 330cd 204bhp.. I can see the sensor but where is it plugged in to on my engine? I have really mpg and rich smell from exhaust. I am hoping that this solves my problem. Thanks, Terry
July 1, 2013
  Followup from the Pelican Staff: Your electrical connectors will either be located directly above the sensors near the exhaust manifold, or near the fuel injectors on the cylinder head. - Nick at Pelican Parts  
tcphoto Comments: I replaced my two pre cat O2 sensors today on a '01 325cic. It had to have been the easiest DIY that I've ever completed. It took the O2 sensor socket, 10" extension and 3/8 ratchet to remove and install the new sensor. I did not remove the engine cover because the wire clips are in plain sight and it took only a few minutes to complete the job. Why make it more complicated than it needs to be?
April 16, 2013
  Followup from the Pelican Staff: The procedure applies to multiple E46 models. Early models the connectors are covered by the engine covers. I'm glad you were able to save time on your repair. - Nick at Pelican Parts  

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