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O2 sensors keep going out

This is a discussion on O2 sensors keep going out within the General Help forums, part of the LSx Technical Help Section category; Man my car is doing the same thing the ses light comes and goes with 02 sensor codes but i ...

  1. #21
    Yeah baby! Yeah! silverWS6's Avatar
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    Man my car is doing the same thing the ses light comes and goes with 02 sensor codes but i do have a small exhaust leak right at the head/headers and i think that is what's causing it

  2. #22
    crazy ass white boy dennis ss's Avatar
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    Quote Originally Posted by silverWS.6 View Post
    Man my car is doing the same thing the ses light comes and goes with 02 sensor codes but i do have a small exhaust leak right at the head/headers and i think that is what's causing it
    That sounds like your problem. I doubt your sensors are bad, they just can't get an accurate reading. I fixed my problem and all is well so hopefully it will stay that way

  3. #23
    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by pajeff02 View Post
    Any additional air entering AFTER the combustion chamber will cause the O2's to read lean and result in fuel being added to the engine. Any vacuum leaks would add air BEFORE the combustion chamber and result in a lean condition as it is being introduced after the MAF.
    Quote Originally Posted by silverWS.6 View Post
    Man my car is doing the same thing the ses light comes and goes with 02 sensor codes but i do have a small exhaust leak right at the head/headers and i think that is what's causing it
    Fix your leak. If your car runs too rich too long, you'll end up not only fixing your exhaust leak, but also replacing your O2 sensors. You'll probably see an increase in fuel mileage by fixing it too

  4. #24
    Member bsteff's Avatar
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    My car keeps popping the 1311 and 1511 codes.....just changed to the bosch 13111's re-tuned the car and it still set them off!!! This is the 3rd set of O2's and tune.....

  5. #25
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    It's possible for a bad or aftermarket MAF to cause a rich condition correct??
    Bad? Sure.
    Aftermarket? No likely...they tend to lean you out more than anything to get their 'claimed' power gains.



    What exhaust is on the car? Any chance the O2's are getting fresh air?
    Are the ones you are purchasing heated units?

  6. #26
    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    Bad? Sure.
    Aftermarket? No likely...they tend to lean you out more than anything to get their 'claimed' power gains.
    I knew they leaned you out...but I didn't know if it was possible for the PCM to add too much fuel from the lean condition actually putting the car into a rich condition or...I've thought I seen where the MAF will give a false reading where the car thinks it's running lean when it's actually not and thus the PCM dumps more fuel to compensate making it rich.

    Or...I could be blowing smoke up my ass too

  7. #27
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    I knew they leaned you out...but I didn't know if it was possible for the PCM to add too much fuel from the lean condition actually putting the car into a rich condition or...I've thought I seen where the MAF will give a false reading where the car thinks it's running lean when it's actually not and thus the PCM dumps more fuel to compensate making it rich.

    Or...I could be blowing smoke up my ass too
    I get what you are saying.
    But the computer will tell you it is lean as it is dumping fuel to make up for it.

    If he is getting the 'too rich' code, the computer is actually pulling fuel but still getting too much at the O2's.

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