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newbie question

This is a discussion on newbie question within the Computer & Tuning forums, part of the LSx Technical Help Section category; my ses light came on and the DTC was P0420 (efficiency below threshold/catalyst below threshold) i know dumb question but ...

  1. #1
    myothercarisaambulance rigdoctormark's Avatar
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    artic white
    2002 camaro ss

    newbie question

    my ses light came on and the DTC was P0420 (efficiency below threshold/catalyst below threshold) i know dumb question but what does that mean? your help would be greatly appreciated.

  2. #2
    Token V6 Guy
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    your cat or cats might be going bad.

  3. #3
    Senior Member
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    Most likely your drivers side cat is toast. Lots of threads on this - go to the main forum page and put P0420 into the search - I got 23 hits. Good news is it might be covered under warranty.

  4. #4
    myothercarisaambulance rigdoctormark's Avatar
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    artic white
    2002 camaro ss

    thanks for the help guys.

  5. #5
    Senior Member ss~zoso~ss's Avatar
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    if your cat is bad, it WILL be covered under the federal emmissions law/act, if not covered under warenty

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