Boxster Parts Catalog Boxster Accessories Catalog Boxster Technical Articles Boxster Tech Forums
 
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Oxygen Sensor Replacement
 
Bookmark and Share

Pelican Technical Article:

Oxygen Sensor Replacement

Time:

1 hour1 hr

Tab:

$100 to $400

Talent:

**

Tools:

Floor jack & jack stands, 22mm wrench

Applicable Models:

Porsche 986 Boxster (1997-04)
Porsche 986 Boxster S (2000-04)
Porsche 987 Boxster (2005-08)
Porsche 987 Boxster S (2005-08)

Parts Required:

New Oxygen Sensor

Hot Tip:

Use anti-seize compound on the threads of the sensor to make it easier to replace it next time

Performance Gain:

More accurate air/fuel mixture, and better running engine

Complementary Modification:

Install an aftermarket exhaust system or replace old exhaust gaskets
101 Performance Projects for Your Porsche Boxster

This article is one in a series that have been released in conjunction with Wayne's new book, 101 Performance Projects for Your Porsche Boxster. The book contains 312 pages of full color projects detailing everything from performance mods to changing your brake pads. With more than 950+ full-color glossy photos accompanying extensive step-by-step procedures, this book is required reading in any Boxster owner's collection. The book is currently available and in stock now. See The Official Book Website for more details.

The oxygen sensors (also called an O2 sensor) are 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 sensors are located in the exhaust system of the engine, and they sense the oxygen content of the exhaust gases. There are a total of four on the Boxster: two for each catalytic converter on each side of the car. The sensor located just in front of the catalytic converter measures the mixture of the exhaust gasses exiting the engine. The sensor located after the catalytic converter is used to measure the performance of the converter by comparing the O2 levels before and after. 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. Almost all of the time, the Boxster's computer will give a warning signal that lights up the Check Engine Lamp if the signal received by the computer is out of its normal range. Sometimes the computer may output an error code stating that the oxygen sensor is reading out of range, when in reality the values are indeed out of range because there is something else wrong with the fuel injection system. Prior to replacing the oxygen sensors, make sure there are no other codes being recorded that may affect the O2 sensor readings. For more info on reading these fuel injection codes, see Pelican Technical Article: Reading Fuel Injection Fault Codes / Diagnosing Problems.

If you disconnect the oxygen sensor and ground it to the chassis, the ECU will think that the car is running lean (not enough fuel), 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 project's scope. If you think that the oxygen sensors may be causing some of your fuel injection problems, they should be replaced. In general, I recommend that you do this every 30,000 miles. You have to jack up the car to gain access to the sensor (see Pelican Technical Article: Jacking Up and Lifting the Boxster on Jack Stands).

Using a 22mm wrench, simply remove the sensor from the exhaust pipe. On the Boxster, the sensors are very easy to reach. On many other cars, you would need a special deep socket with a slit cut in the side to remove it. The electrical plug for the O2 sensor simply unplugs from the chassis plug. New O2 sensors should have the same exact plug - ready to attach to your car. When you remove the O2 sensor, you will probably find that it is coated with black soot. This is normal for an old, worn out O2 sensor. On our project car here, the O2 sensor was covered in motor oil and coolant. This is a bad sign that corresponded with the seized engine in my project car (I bought it that way). See Project 13 for more details on the problems sometimes found with these late-model Porsche engines.

Install your new sensor snug-tight, or 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, but make sure the anti-seize doesn't get into any of the slits on the head of the sensor. Check the sensor first though, as new ones sometimes come with anti-seize already on the threads.

There are two different types of sensors you can purchase: generic ones that allow you to snip the connector off of the old sensor and put it on the new one, and original OEM sensors with the correct connector. On older cars, I used to use the generic sensors, but I've had problems with using them on these newer cars. Researching further, I discovered that the wires and connectors are very important on these O2 sensors. The Porsche factory workshop manuals state the following:

"911 Carrera 4 has a new, water-proof oxygen sensor. Water-proof means that the upper sensor section and housing are connected leak-proof with a later welded seam and previous reference air openings are omitted. Reference air is now taken via the connecting lead and plug connection. For this reason it is important to keep contact solutions, lubricants, liquids or similar products out of the 3-pin plug, since they would lead to sensor failure"

Soldering wires together can interrupt the reference air signal and lead to problems with the sensor. I've also had problems with the Bosch factory Posi-Lock connectors that are supposed to work with these newer sensors. Because the relationship between the connector and the O2 sensor is so vital to the proper reference signal, I recommend that you only use the correct sensors with the proper plug.

Shown here is the catalytic converter and its two oxygen sensors (red arrow shows the front, yellow shows the rear).
Figure 1

Shown here is the catalytic converter and its two oxygen sensors (red arrow shows the front, yellow shows the rear). The small black connector, shown by the green arrow, attaches the sensor the wire harness and can easily be removed by pushing the release tab. I have often found that the new O2 sensors come with the correct plug, but sometimes the cable is way too long. If this is the case, then secure the cable with a nylon zip-tie. 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. The photo inset shows the special tool that is sometimes required to remove O2 sensors in hard-to-reach places (available from PelicanParts.com).

Bookmark and Share
Comments and Suggestions:
Kenny Comments: My 2007 Cayman with 41,000 miles is getting a P0421 code which I think is a catalyst warmup error. Is the likely problem the drivers side secondary 02 sensor? I have stock headers/cats and a borla catback exhaust which is after the factory 02 sensors.

November 14, 2016
  Followup from the Pelican Staff: Cat codes are almost always faulty cats, not o2 sensors. - Nick at Pelican Parts  
excav8 Comments: P0160 boxter 986
i I have had one exhaust oxygen sensor replaced and the above code returns. But to basics- which side is bank2 when looking from the rear. My icarsoft 960 reports cat back2 bank 2 issue as above.
September 4, 2016
  Followup from the Pelican Staff: The code is for bank 2 sensor 2, post cat sensor on bank 2. Left side of engine, when sitting in driver seat.- Nick at Pelican Parts  
gilelvis Comments: I have a 2000 Boxster s,after replacing gear box igot...
p1115 oxygen sensor heater ahead of catalytic converter bank1.
p0134 02sensor ahead of cat.conv. cylinder 1-3
cheak engine light not on but car is idle not so good
please help me so i know what i need to buy and replace..
thanks














August 4, 2016
  Followup from the Pelican Staff: I would check if the oxygen sensors or wiring is damaged or disconnected. - Nick at Pelican Parts  
KPBoxsterS Comments: I have a 2001 bolster s with 132,867 miles and have codes p1128, p1130, p0420 and p0430. Do I need to replace both cats?
July 20, 2016
  Followup from the Pelican Staff: I would fix the fuel control faults first. Then see if the cat codes return. Check when the fuel trim is skewed, I can offer more help with that info. - Nick at Pelican Parts  
Lenny Comments: Can I please have a person reply to my July 15 question? I have read the technical articles and they do not address the questions I asked or problems I encountered. Thanks.
July 18, 2016
  Followup from the Pelican Staff: I replied on July16:
With both banks setting the codes, look at something that can affect both. Vacuum leak, air oil separator, fuel delivery or the mass air flow sensor. Check when the fuel trim is faulty using a Porsche scan tool. Once you see when it is not in spec, you will have a better idea of what component can cause it. I can offer more advise with this data as well. - Nick at Pelican Parts
 
Lenny Comments: My 2000 Boxster S suffered from 1128 and 1130 codes for years. Replacing the Mass Air Flow sensor - twice - didn't seem to help I bought the Bosch version from Pelican. When we replaced the engine this year with a 2002, because of coolant in the oil not the heads or gasket, it came with its own O2 sensors. I thought my check engine light problem was solved. But... no luck... this engine runs great, smooth, better than the original - but codes 1128, 1130 1115 reappear within 60 or less miles! we swapped sensors from the original engine - no luck. We installed 2 new O2 sensors before CAT - no luck.
Please advise - how can I rid myself of this nemesis that has followed me to a whole different engine?!?
BTW... the computer is the original 2000 one - had to replace the wiring harness on the '02 engine to match it.
Thanks!
July 15, 2016
  Followup from the Pelican Staff: With both banks setting the codes, look at something that can affect both. Vacuum leak, air oil separator, fuel delivery or the mass air flow sensor. Check when the fuel trim is faulty using a Porsche scan tool. Once you see when it is not in spec, you will have a better idea of what component can cause it. I can offer more advise with this data as well.- Nick at Pelican Parts  
Buzz Comments: Just replaced my O2 sensor 98 Boxster with a Bosch Premium OEM bought from you, also have your 101 Projects book. The biggest problem was opening the red sliding lock on the sensor...maddening! What is the trick? No mention in book or on site.
June 10, 2016
  Followup from the Pelican Staff: The lock can stick due to dirt. lever it away using a small flathead screwdriver. - Nick at Pelican Parts  
ziomster Comments: Maybe this is not right place ot ask such question but i will try: Can you provide me with any scheme for wiring spark plugs? i had some problems with the car and i would like to check if the all spark plugs are connected with correct wire. Any picture or scheme would be apreciated. thanks in advanced
June 7, 2016
  Followup from the Pelican Staff: I don’t have that info.


I would grab a repair manual. It will have the wiring.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
DChris Comments: hello, i got an 2002 Boxster S and got P1110 code and cleared it, what should be my next move? do i replace both sides? thanks!
March 19, 2016
  Followup from the Pelican Staff: I think the code is for Bank 2 sensor 2 o2 heater. I would replace just the sensor with the code. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need. - Nick at Pelican Parts  
concierge Comments: This is a very useful link I have porsche boxter 2.5 1998 my question is non of the error codes relate directly to O2 censor but misfires on cylinder 1 P1313 emission related P1319 emission related other codes all indicate misfire P0300,P0301,P0304,P0303 all problems started after an engine clean of the carbon deposit through fuel system plugs and coils have all been changed I hope O2 censor on bank 1 will help.
March 15, 2016
  Followup from the Pelican Staff: You need to determine what is causing the misfire. I would check spark, fuel and compression on all cylinders.
- Nick at Pelican Parts
 
DanOX Comments: Hi, I've recently had my 2004 tip in a garage where they've replaced the gearbox. When they returned the car it has a cel on and they explained that they've had a quick look but can't see the problem but might need 2 new o2 sensors. I've rigged it up to my scanner and get P0134 and P0154 codes. If I reset the codes they return within 2 or 3 miles. I've read it's rare for both sensors to fail at the same time - would you suggest checking anything else before I get them both replaced? Car seems to be running fine. 2004 2.7 986
February 28, 2016
  Followup from the Pelican Staff: The sensors may have been left unplugged or damaged during the repair. I check them for physical damage. - Nick at Pelican Parts  
Yeoblade Comments: 2004 Boxster 60,000 3.2S UK
Hi, I have a P2096 fault code from OBDD2 using Torque phone app. listed as:
P2096: Post Catalyst Fuel Trim System Too Lean bank1
I guess this is anO2 sensor fault, not MAFF ?
January 28, 2016
  Followup from the Pelican Staff: I would use a different scan tool to be sure the code is correct. That code can be set by a fuel control issue, faulty cat or sensor. - Nick at Pelican Parts  
LonglivePorsche Comments: I have a 2000 Porsche Boxster S with codes P1128 and P1130. Do I need to replace the O2 sensors? If so, which ones? Thank you much.
December 18, 2015
  Followup from the Pelican Staff: These codes are more commonly cause by a faulty mass air flow sensor. - Nick at Pelican Parts  
Charlie Comments: P1125 Code on 99 Boxster. Not sure if this means I need to replace one or two O2 sensors on Bank 1 and if so which one? pre-cat or post cat. But I wonder what else can be the issue. I dont have a combo codes of 1123 and 1125, just the 1125, and I just replaced the MAF to no avail anyway.

November 20, 2015
  Followup from the Pelican Staff: That code is for a fuel trim fault, not a faulty o2 sensor. You will need to check when the vehicle is having a fuel trim issue, at idle or when driving. Then check which component is causing the issue. For example, vacuum leak or maf sensor. - Nick at Pelican Parts  
Blackgt Comments: Hey, I not only got the code po1126 but also p1133 After getting a new MAF sensor installed. I put in a new dealership MAF sensor because I got a po1124 code. Now my 2002 porsche boxster works better now but still idles when the engine is cold and I run it over 3000 rpms. My guess now is that I have to change the oxygen sensors. What do you recommend?
October 27, 2015
  Followup from the Pelican Staff: I would check if the sensor installed is the right for the vehicle, or maybe the ducting has an air leak. - Nick at Pelican Parts  
optimus Comments: hi getting codes leading to the 02 sensors I've replaced all of them and still getting cel my mechanic said it could be a faulty fuel pump giving low pressure thus I'm getting cel how do i know if its really fuel pump? thanks.
August 5, 2015
  Followup from the Pelican Staff: What is the vehicle? What are the codes? - Nick at Pelican Parts  
Toppbrass 58 Comments: Hi
On a boxster 1997 do you have available the male connector for o2 sensors i have one that is broken went to porsche told me this connector not available it part of oe wiring hareness.
4 pin male connector
June 9, 2015
  Followup from the Pelican Staff: We should be able to get it for you.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need. - Nick at Pelican Parts
 
jamesness1 Comments: hi, i have an 02 boxster 2.7 egas, there is an intermittent idle issue that seems to come and go, where the idle jumps up and down. there was a code for the MAF so i have replaced that, the AOS, all spark plugs,ran a smoke test, replaced the plastic tubing and seals for the spark plugs, changed the oil,replaced the air filter, new serpentine belt, cleaned the throttle body,reset the throttle body, checked proper voltage of the battery with the car on, and off so the alternator is fine as well, checked fuel pressure which is fine, and needless to say i am still experiencing this random idle issue. it seems to kind of cut out under throttle acceleration and idle surge when at a stop, but as stated before it occours randomly, and is not constant, no CEL is on and, basically all i can possibly think of is that it might be the o2 sensors bad but not throwing a code? any input would be awesome, this thing has become a nighmare of a headache, thanks!
June 9, 2015
  Followup from the Pelican Staff: You will need to check the fuel trim values, see which way the RKAT, and FRA are trending. Once you know that you can see which way to go. I would bet though...this is just an educated guess based upon years of experience and the fact that you've covered all other bases, your vacuum reservoir is faulty. Access the vacuum reservoir, apply vacuum and it should hold the vacuum you apply INDEFINITELY. Any loss of vacuum means that component is faulty. These do not smoke when faulty which has always mystified me. I applaud your troubleshooting prowess keep up the good work! - Casey at Pelican Parts  
Carl Comments: I have a 1998 Boxster and the check engine light just came on. I scanned it and got codes: 1123 and 1125. I checked online and it looks like 2 of the O2 sensors. I just need to know if it is the two before or after the catalytic converter?
June 6, 2015
  Followup from the Pelican Staff: 1123 and 1125 are fuel trim fault codes, your car is running too rich. I would check the mass airflow reading with a scan tool. Should be 15-17 kg/h at idle warm with the a/c off. If it is too high, replace the mass airflow sensor. If it is in spec, check fuel pressure, it could be too high but that is VERY rare. This is most likely a fault with the mass airflow sensor. - Casey at Pelican Parts  
Taz1 Comments: I have a 2000 Porsche Boxster 2.7 with the code P1119. I went to auto zone for an O2 sensor and they told me the sensor I need is the bank 2 senser 1. can you tell me where this is located on the car.
March 18, 2015
  Followup from the Pelican Staff: left side of engine, sensor before the catalyst. - Nick at Pelican Parts  
bobatious Comments: Looking for replacement part for the chassis side connector for 986 '97 driver side post-CAT O2 sensor. Somebody broke this so the retaining feature does not work - though electrically it does still work.
March 3, 2015
  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
 
Fatboykill Comments: Hey...

My 2002 2,7 228ps Boxster is only throwing code P0134..

What means this?

regards from Germany
February 4, 2015
  Followup from the Pelican Staff:
Check wiring and connection first if everything looks OK replace sensor.

P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) -
http://www.pelicanparts.com/techarticles/Boxster_Tech/19-FUEL-02_Sensor/19-FUEL-02_Sensor.htm
 
Wade Comments: Is the O2 sensor on the right side of the motor located on the drivers side? Mahalo
December 11, 2014
  Followup from the Pelican Staff: Right side is the right side when viewed sitting in the driver seat. - Nick at Pelican Parts  
Polly Comments: Had 2 separate guys check car, no codes came up. Started far & left running for an hour then took road test. Cars seems to run pretty good. Could it be bad leads, or just bad fuel as car was sitting for 2-3 months?
December 2, 2014
  Followup from the Pelican Staff: Could be fuel, spark or compression. Check the items I noted earlier. - Nick at Pelican Parts  
Wade Comments: I have a 2000 boxster S and my blue point scan tool say the number 1 cyclinder head O2 sensor is bad. Which O2 sensor is it? Thanks for your help.
December 1, 2014
  Followup from the Pelican Staff: That is the oxygen on the right side of the engine, before the catalyst. - Nick at Pelican Parts  
Polly Comments: I have a 2001 Boxster s, I've replaced the AOS and one of the C02 sensors but car is still running very rough & really won't run at all. I replaced the c02 sensor as code P0300 ,0301,0302,0303 ??
November 29, 2014
  Followup from the Pelican Staff: Sounds like an engine misfire. I would check spark, fuel and compression on all cylinders. - Nick at Pelican Parts  
John Comments: Follow up. 2001 Boxster S. Had code P0133 only. Replaced both O2 sensors bought from Pelican Parts. I cleared the code, it came back 30 miles later. I've also checked for exhaust leaks and have not found anything. I've checked the fuel trim and the LT term fuel trim remains constant at about .76 and the ST fuel trim is also unremarkable. Is it possible that I received at least one bad sensor?
October 13, 2014
  Followup from the Pelican Staff: Those reading at IDLE look OK. How does fuel trim look under normal driving conditions and 2500rpm in Park?

If the same, you may have a defective o2 sensor.
- Nick at Pelican Parts
 
John Comments: My 2001 Boxster S is only throwing code P0133. I've replaced both pre O2 sensors and cleared the codes. After about 30 miles the CEL came back on. I've checked for poor connection, reset the codes, and about 40 miles later the P0133 code is back. Suggestions?
September 29, 2014
  Followup from the Pelican Staff: Check that the exhaust is sealed. look for small cracks or signs of leaking. - Nick at Pelican Parts  
Ken Comments: Hi, I have. 98 Boxster w 35,000 miles. Engine code read drivers side before cat o2 sensor. Replaced o2 and same code appeared 500 miles later. You mention in other comments that it could be fuel trim issue that can be checked w a porsche scan. What is this scan, can I do it at home, is it addressed in your 101 project book or where can I find info about this issue? Thanks
September 26, 2014
  Followup from the Pelican Staff: A scan tool is a device for reading fault codes, system tests and displaying data from the vehicle computers; it is a tool. You can ask a local shop with one to check the fuel trim for you. It is an engine parameter. - Nick at Pelican Parts  
Justin Comments: Hi,

I have the following 2 codes: P1275 = Oxygen sensor aging ahead of catalytic converter, cylinder 1-3 DTC 16
AND P1276 = Oxygen sensor aging ahead of catalytic converter, cylinder 4-6 DTC 22.

What I am confused about is which sensor they are, pre-cat or post-cat?

They both say "ahead", rather that "before" which I believe is the terminology used on these fault codes so to me due to the flow of the exhaust system I would think that "before cat" would mean closest to the engine and that "ahead of cat" my codes would mean after the cat closest to the silencer muffler. Can you clear this up for me? So would it be the Yellow Arrow or Red Arrow on your photo?

Also you say "I used to use the generic sensors, but I've had problems with using them on these newer cars". I was wondering what you mean by newer cars; I have an 02 Boxster 986, do you think I would have problems with the generic type sensor here?

Thanks!
September 13, 2014
  Followup from the Pelican Staff: Before THE CATALYST. I would stick with a sensor made for your vehicle, avoid generic ones. - Nick at Pelican Parts  
polo Comments: my car is reading the following codes P1115,P1117,P1118 and P1119. my car is porsche boxter 2000 2.7 , I did replaced the 4 02 sensors and the. 2 pre, catalytic . and. the. obd II still. reading the same codes , please help me to find the real problem with my car. thanks so much.
September 12, 2014
  Followup from the Pelican Staff: You may have a fuel trim issue. Check fuel trim using a Porsche scan tool. Once you see which way it is skewed you can address and repair the issue. - Nick at Pelican Parts  
Pspeid001 Comments: Have 1999 boxster replace all o2 sensors . One day after they where replaced ck engine light game back on with these codes p1128 & p1130. After reading a few posts about o2 all the o2s had the same part they Bosch brand could this be my problem & how will no which are o
June 8, 2014
  Followup from the Pelican Staff: Likely a fuel trim issue. I would check fuel trim under all driving conditions. This will help you determine where the problem is. - Nick at Pelican Parts  
JHenry Comments: I just completed an AOS and water pump replacement on my 1999 boxster, 72k miles.
CEL comes on and throws a code P0134 Bank 1 Sensor 1 02 Sensor.
The AOS did fail and I cleaned as much oil out of the intake and throttle body as I could. The car has been back on the road 2 days, light came on and I checked the code today. Cleared the code and ran the car again. Running well all day today. Question is, should I wait and see if the CEL comes back on with the same code or is there a chance I'm simply seeing some residual oil causing the mixture to be off from the AOS failure?
May 24, 2014
  Followup from the Pelican Staff: The oil may have contaminated the sensor. There is a chance the code may stay away. If it does consider yourself lucky. As O2 senors generally do not recover from contamination. - Nick at Pelican Parts  
dan09 Comments: What I mean strange, it's the difference between the Durametric reading and the " local MOT " reading ...
April 5, 2014
  Followup from the Pelican Staff: The will vary continuously, keep that in mind as O2 sensor voltage fluctuates. - Nick at Pelican Parts  
dan09 Comments: I have no fault codes for O2 sensors
Durametric data : voltage O2 sensor ahead cat : from 0.1 to 0.75 V for each bank
voltage O2 sensor behind cat : 0.69 to 0.73 V for each bank
Oxygen sensing mean value : 0.99 to1.01 for each bank
It's very strange !
March 31, 2014
  Followup from the Pelican Staff: That looks Ok to me. What do you see that is strange? - Nick at Pelican Parts  
dan09 Comments: Problem on Boxster S 2003 , 42000 miles
Here, in France there is a legal obligatory technical control each 2 years : result = refused because Lambda value too high about 1.3 instead of 1.03 maxi
-Idle ver regular, cool or warm engine
-no check alarm
-no error message with Durametric reading
What are the right value for voltage of these Lambda gauges ?
Is it the wright way to identify the wrong gauge ?
Thank you for your help
March 29, 2014
  Followup from the Pelican Staff: Do you have fault codes for the o2 sensors? The code will identify the faulty sensor by bank and position. - Nick at Pelican Parts  
Le Chef J Comments: I have a 2001 Boxster. Check engine light came on and my mechanic said it was 02 sensor. I had him repair it. The cost was just under $1000. 150 miles later, the check engine light came back on. He says it's the other 02 sensor. I believe I can replace it myself. Will I be able to tell by looking at the two of them which one has been replaced and which is the old one and needs replacing? I am not going back to the mechanic, or I would just ask him.
March 20, 2014
  Followup from the Pelican Staff: The fault code will direct you to which sensor is problematic. I would start there, - Nick at Pelican Parts  
Michael Comments: have a 2000 2.7 boxster. The check engine light came on and my shop siad it indicated 4 faulty o2 sensors They check them out and said they were ok. The light is back on and I have to bring it back the fault codes they gave me P1117, P1115, P1119, P1118, P1341. they also said is could be a bad B1 cam adjuster. Can you please help me make sense of all this.

Thanks so much
February 6, 2014
  Followup from the Pelican Staff: Some of those are fuel trim faults. I would check the vehicle fuel trim and see where it is, rich or lean. Then check what would cause that issue. For example, a vacuum leak could cause a lean condition. - Nick at Pelican Parts  
sweet16 Comments: Hello, for 2001 boxster s.

DME M3301 have 3 faults present:
-Oxygen sensor behind catalytic converter, bank 1
-Oxygen sensor ageing period, bank 1
-Oxygen sensor ageing delay, bank 1
suggested part number: 98661866005
I can't locate the listed part number to purchase???
January 15, 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
 
Franck Comments: Hi, would it be possible to experience a severe engine damage because of O2 sensor failure? Driving on the motorway at 140 km/h...
Many thanks
January 8, 2014
  Followup from the Pelican Staff: No. The catalyst could overheat and fail. But I cannot imagine how the engine would be severely damaged. If the sensor fails and a fault code is set, the DME defaults to open loop. - Nick at Pelican Parts  
Tonyb Comments: I have a 1997 Boxter and I have had it for eight years now and I have had many years of trouble free driving,the problem that I have at the moment is that when my engine is warm and I start it the rev's go to 2000 and slowly drop to normal. I have taken it into the mechanic and he said that it was a air leak, he fixed it and two weeks later the engine started to rev to 2000 and back all of the time so I took it back and he fitted a new sensor$1,200 it worked fine for two months and now it has started to rev to 2000 and back to normal.
Have you any suggestions as I am not wasting any more money on so called mechanics.
Tony
November 29, 2013
  Followup from the Pelican Staff: You could have a vacuum leak or a faulty air oil separator. You can also check the crankcase vacuum, this will help you diagnose the crankcase breather valve.
- Nick at Pelican Parts
 
Dan K Comments: I have a 2001 Boxster S. The check engine light came on so I took it to the dealership. They said it was one of the O2 sensors. If I replace the sensors will the check engine light reset itself? I'm planning to replace them myself.
October 26, 2013
  Followup from the Pelican Staff: After two good monitor trips, the light will shut off. The DME will have to run the oxygen sensor monitor twice without a fault. Or sometimes, the fault will clear after 40 key cycles. - Nick at Pelican Parts  
broken2bfree Comments: Comments: I had a cel/ pre cat o2 sensor bank 2 code so I replaced the sensor and cleared the code. Almost exactly 100 miles later, cel and code came back pre cat bank 2. I would have bet the cel was due to post cat this time but not. Any suggestions?
October 1, 2013
Followup from the Pelican Staff: What is the vehicle model / year and code number? - Nick at Pelican Parts

Sorry, 2000 boxster
code:P1119 Porsche fault code 5 - Heating power O2S ahead of cat. c. bank 2
October 12, 2013
  Followup from the Pelican Staff: This is a heater code. I would check that the oxygen sensor heater is getting 12 volts and the heater is being activated. You may have a bad fuse or shorted wire. - Nick at Pelican Parts  
broken2bfree Comments: I had a cel/ pre cat o2 sensor bank 2 code so I replaced the sensor and cleared the code. Almost exactly 100 miles later, cel and code came back pre cat bank 2. I would have bet the cel was due to post cat this time but not. Any suggestions?
October 1, 2013
  Followup from the Pelican Staff: What is the vehicle model / year and code number? - Nick at Pelican Parts  
vreel Comments: Hello. 1999 Porsche Boxster automatic. Car starts up great and idles great. If I accelerate quick the motor cuts out and it takes a couple seconds for it to actually accelerate. It drives great down the road at 30 or 90pm without a problem, but as soon as I press on the pedal It cuts out and struggles. If I slowly press on the pedal it drives fine. Please help, I cannot find anything that explains this. I replaced the fuel filter and no change.
August 29, 2013
  Followup from the Pelican Staff: Sounds like you have a bad mass air flow sensor. Before replacing it, check 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  
aj Comments: how do you pull up the engine codes on a 1998 boxter?
August 27, 2013
  Followup from the Pelican Staff: Connect a scan tool to the 16 pin OBD II connector. Follow the instructions on the scan tool screen for reading fault codes. - Nick at Pelican Parts  
Blue Toro Comments: I have a 3.2L 2004 Boxster S and your site says it has the pre cat sensors with rectangle plugs and after cat has a different pn. Porsche parts have given me the same part number for all 4 that matches your pre cat numbers. I would like to purchase from your parts department.
August 19, 2013
  Followup from the Pelican Staff:
Give our parts specialists a call at 1-888-280-7799. They can help you find the right sensors. - Nick at Pelican Parts
 
surferjp Comments: Which code reader works well with the boxster, my obd2 reader from autoxray will not fit into the obd2 socket.
July 17, 2013
  Followup from the Pelican Staff: If your code reader had an SAE 16 pin OBD II connector, it should work on your vehicle. Give our parts specialists a call at 1-888-280-7799. They can help you find a scan tool. - Nick at Pelican Parts  
boxstergt Comments: What are the correct oxygen sensors for a 99 boxster with a 99 3.4 liter 996 motor. Car has an FVD boxster S exhaust headers, sport cats, muffler with softronic tune. I am getting p1127 and 1129 codes. I was getting codes then they stopped when I had a bad MAF code. I replaced the MAF and now the car is running much better again, but the O2 codes are back.
June 10, 2013
  Followup from the Pelican Staff: Check that the fuel trim is operating normally before replacing the oxygen sensors. You may have a vacuum leak or faulty component setting the oxygen sensor codes. If you find they are bad, give our parts specialists a call at 1-888-280-7799. They can help you find the right part. - Nick at Pelican Parts  
Jim Comments: On my 1997 Boxster with 40k miles the check engine light is on but the car seems to be running well. Power is same as always and no missing. When I read the codes the first is "02 sensor cut no activity bank 1sensor 1" and the second code is "enhanced DTC see service manual". Can you tell me which specific 02sensor is bank 1sensor1 and what does enhanced DTC mean
April 7, 2013
  Followup from the Pelican Staff: The first code is telling you the oxygen sensor before the catalyst on bank1 is inactive. The second code is a Porsche specific code and cannot be displayed by a generic scan tool. If you provide the P-code number I may be able to help. - Nick at Pelican Parts  
mikesz Comments: are all 4 o2 sensors on a 99 boxster the same part number?
March 11, 2013
  Followup from the Pelican Staff: No they are not. If you give our parts specialists a call they can help you sort out the part numbers: 1-888-280-7799 - Nick at Pelican Parts  
Chris Comments: Hi can you help please?
Boxster S 2000 yr 67K miles
I had intermittent power reduction with the engine under load. It ticks over perfectly and revs OK at stand still. No engine check light and no codes thrown.
Replaced MAF sensor correct and genuine part caused permanent reduction of power under accelerating load. Changed back to original MAF, power came back but with original intermittent power loss problem.
Found an exhaust leak triangle gasket white powder in exhaust on left side indicating lean running brown powder on right side. After gaskets replaced then Engine Check light came on for the first time. Codes suggested O2 sensor and MAF, replaced O2 sensor, and no more engine check light but still intermittent loss of power under load???
Since O2 sensor was changed and when the intermittent fault is not present, the performance is better than ever. When fault occurs, which is much of the time, it feels like the engine is not getting enough fuel or air or to much???
All coil packs were changed 2 years ago at 45K miles
I'm thinking the MAS is also playing up but with the faulty 02 sensor the new replacement MAS could not perform properly and caused permanent power reduction. Or, vacuum leak
Any ideas please
January 14, 2013
  Followup from the Pelican Staff: It sounds like you tried to replace the mass airflow sensor, when there might've been a problem with the oxygen sensors. I'm not sure if you tried the new mass airflow sensor with your new oxygen sensors. I would probably try this first, and see if this fixes the intermittent problem. Other than that, you need to read the codes that the fuel injection system is outputting to you when there is a problem. These modern fuel injection systems are pretty good at telling you what is wrong with them. But you need to read the codes at the right time. Also, if there is a problem with one component of the system it may show up as a code indicating a fault with another component of the system. For example, if the engine is running very rich, then an oxygen sensor code may be may be tripped because the oxygen sensor will be detecting a rich running condition in the exhaust.- Wayne at Pelican Parts  
Brent Comments: Quick question sir, I recently purchased a 98 boxter w 85 thousand miles at first typical symptoms described herein , the man I purchased the car from told me about the o2 sensor being bad I kept driving the car the condition progressively worsened to the point of not running well enough to drive it at all is that typical ????
December 1, 2012
  Followup from the Pelican Staff: The problem you describe could be the oxygen sensor or sensors or another copmponent that controls the fuel mixture. I would recommend having your engine scanned for fault codes first.

- Denny at Pelican Parts
 
Kimberboy Comments: I appreciate that info, Thanks for your helpful responses. I was checking error codes last night, so the ignition was on for what apparently was long enough to warm the sensors up, because when I started the car, it ran smooth, not rough like it usually does when it's cold like it was. It always runs great when it warm. So it seems to confirm the problem is the two "before". We had a nice ride today with a stop off to look at a couple '02-'03 Carrera's Merry Christmas. And thanks again.
December 11, 2011
  Followup from the Pelican Staff: No sweat... - Wayne at Pelican Parts  
Kimberboy Comments: Must be a "no brainer" with no questions on this subject, so I'll break the ice with a ~ dumb one. Always replace all four?
December 3, 2011
  Followup from the Pelican Staff: It depends. The first two are the most crucial to proper operation of the car. The rear two are basically just there to check the operation of the catalytic converters. So, when asked this question, I typically tell people to be sure to replace the two front ones, and then the rear ones after that if you want to. But the front two are what measure the mixture of the engine and are most vital to the proper operation of the car. That said, they do wear out over time, and if you're taking the time to replace one or two, I think you might want to replace all of them "while you're in there." - Wayne at Pelican Parts  

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Sat 12/3/2016 02:10:59 AM