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Check Engine Light

Discussion in '80-Series Tech' started by Doschev, Apr 2, 2003.

  1. Doschev

    Doschev

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    The check engine light on my '96 went on the other day. I went to Autozone and the diagnostic code pointed to the O2 sensor. I know that there were posts on the old site about this but....

    What's the next step to resolvingthis problem?

    Thanks
     
  2. cruiserdan

    cruiserdan SupportingVendor Emeritus Supporting Vendor Moderator

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    Doschev,

    What was the exact code or codes pulled. There are several that pertain to O2 sensors.......We need more specifics to be able to assist you..........
     
  3. Doschev

    Doschev

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    The code is P0420 - Catalyst efficeince below threshhold.

    The guy at AutoZone reset the light and it didn't come back immediately.

    What next?
     
  4. tenncrusher

    tenncrusher

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    I had that same code come on and was reset about 800 miles ago and has not come back on.

    I am not going to worry about it until it comes back.

    Tenn
     
  5. cruiserdan

    cruiserdan SupportingVendor Emeritus Supporting Vendor Moderator

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    Tenn,

    &nbsp:Did you save the posts on that?

    I can lookup the info and re-post if need be.......

    Regards...Dan :beer:
     
  6. tenncrusher

    tenncrusher

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    Na, cruiserdan, the post scared the heck out of me and I did not save it. However, it went something like this...

    1)Check/ replace front O2
    2)Check/ replace rear 02
    3) Check/ replace CATs

    OUCH!!!!!!

    I reset mine and it has not come back on after many miles and very variable driving conditions. I have my fingers crossed that something passed through that the sensors did not like.......
     
  7. cruiserdan

    cruiserdan SupportingVendor Emeritus Supporting Vendor Moderator

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    DTC code P0420:

    "The ECM compares the waveform of the oxygen sensor located before the catalyst with the waveform of the oxygen sensor located after the catalyst to determine whether or not catalyst performance has deteriorated."

    Trouble area:
    Three way catalytic converter
    Open or short in heated oxygen sensor circuit
    Heated oxygen sensor

    Repair sequence:

    Check sensor 1, bad...replace. ok....check sensor 2, bad....replace. ok.......replace three way catalytic converter....

    Regards....Dan :beer: