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Bad O2 Sensor?

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    #1

    Bad O2 Sensor?

    Ive been having a really annoying idle problem on warm up for the longest time. i also started to have very poor acceleration and the car seems to hesitate. i havn't got a CEL yet but could it be a bad O2 sensor? i havnt changed it since i bought the car and ive had it for about 9 months. And i was told that was supposed to have 3 O2 sensors? one on the manifold, one before the cat , and after the cat. but i seem to only have 1 before the cat. it also has a header on it.
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    #2
    Originally posted by Drifting in 808 View Post
    Ive been having a really annoying idle problem on warm up for the longest time. i also started to have very poor acceleration and the car seems to hesitate. i havn't got a CEL yet but could it be a bad O2 sensor? i havnt changed it since i bought the car and ive had it for about 9 months. And i was told that was supposed to have 3 O2 sensors? one on the manifold, one before the cat , and after the cat. but i seem to only have 1 before the cat. it also has a header on it.
    Sad...who ever told you that is an idiot. Our F22 only has one sensor and it's either on the down pipe of the header or on the header itself depending on what set of headers or if its either a A1 A4 A6

    Yeah it could mean the sensor is going out, if it is its a cheap fix but I would suggest to check timing first.
    Last edited by turboAccordHSF; 05-03-2011, 11:24 AM.


    Originally posted by deevergote
    .......If they seem smart, and just trying to learn, I'll offer as much help as possible. If they seem stupid and lazy, I'll do my best to piss them off so they leave and never come back... while still answering the question.

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      #3
      The ECU isn't reading o2 sensor input at warmup, so until the car is at operating temperature, the o2 sensor is not a factor. The bogging is very possibly the o2 sensor, though.






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        #4
        yeah, its only after warm up it starts to idle weird and bog. and i had my car on the lift yesterday and my only o2 sensor is right before the cat. i have a aftermarket header and i dont have a o2 sensor on that.
        Last edited by Drifting in 808; 05-04-2011, 01:38 AM. Reason: also, it can still have a bad O2 sensor even if it isnt throwing a code right cause its not throwing any codes at all.

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          #5
          The o2 sensor is on the header... either on the upper part or the lower part.






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