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service engine light

This is a discussion on service engine light within the General Help forums, part of the LSx Technical Help Section category; got two codes p0420 bank 1 and a p0300 does anyone know why its throwing those ones a missfire code ...

  1. #1
    Junior Member jprice's Avatar
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    service engine light

    got two codes p0420 bank 1 and a p0300 does anyone know why its throwing those ones a missfire code plugs were just changed and one is catalyaic deal what do they mean please help

  2. #2
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    P0420 is most likely a bad cat - warranty is 10yrs/120K on the 00-02 cars. P0300 could be several things, my car has thrown it a couple times over the years and just cleared it and rarely comes back. You can look up the codes/diagnostics for your year at gearchatter.com, maybe they're related.

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    Member Stricken1's Avatar
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    300 is general misfire.

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    Junior Member jprice's Avatar
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    thanks taking it to a dealer on thursday

  5. #5
    Senior Member SeVeReDiStOrTiOn's Avatar
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    05 Wrangler
    00 Z28 sold :-(

    Check all the plugs for fouling and check the gap while they're out, make sure all the plug wires are on all the way...you should hear two clicks.

    Like 2001NBMZ28 said, the other is most likey the cat. Mine threw a p0430 back in the day and the cat was toast.

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