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DD eng light??? help

This is a discussion on DD eng light??? help within the Firebird / WS6 forums, part of the Vehicle Specific category; i have a 2006 pontiac grand prix as a DD .. its got 60 few k on it.. the code ...

  1. #1
    🤔 11s. blackbirdbrain89's Avatar
    Join Date
    Sep 2007
    hagerstown, mercersburg

    black trans am

    DD eng light??? help

    i have a 2006 pontiac grand prix as a DD .. its got 60 few k on it.. the code is p0420 .. cat code.. is it known to go out on my pos??? or is it just a 02 sensor?

  2. #2
    Member crombie02's Avatar
    Join Date
    Dec 2007
    Richmond, KY

    CETA Coupe M6

    I got that code on my 02 T/A and this is what I have found out:

    I was told it was the Drivers Side Rear O2 Sensor and then this morning my alternator went out. I replaced the alternator with a brand new one (about $150) and the service engine light went out and has yet to come back on.

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