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SES Question

This is a discussion on SES Question within the Computer & Tuning forums, part of the LSx Technical Help Section category; Hey all, I have the dreaded P0300 code and I also have a P0420 code. P0300 - Engine MisFire Detected ...

  1. #1
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    Question SES Question

    Hey all, I have the dreaded P0300 code and I also have a P0420 code.

    P0300 - Engine MisFire Detected

    P0420 - Catalyst System Below Thershold, Left Bank

    The car drives fine from what I can tell. I am not getting the Blinkin SES so I am good on the that. My question is What could be causing it?

    I don't have the rotten egg smell from the exhaust so I don't think it's the Cats. But from researching the 2 code they both can point to the Cats. I plan on changing out my spark plugs on Monday, too eliminate that possible issue for the Misfire. The Wires still look good, but I will replace them when the Funds allow.

    I thought about O2 Sims for the 420 code but I dont know. I just hate the try and error thing. Especially since I did enough of that with my 97 Z. Any ideas on the matter would be great. Thanks Brad

  2. #2
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    GM extended the cat warranty to 10yrs/120K miles back in December for the '00-'02 cars here. Contact your dealer and see if it applies overseas too.

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    So you think it could be the Cats? I guess I will contact the local Chevy Dealer here and see.

  4. #4
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    Yeah, P0420 is usually the drivers side cat. Plug in P0420 into the search, I'm sure either myself or someone else has posted a link to the letter GM sent out.

  5. #5
    Member firemedic0135's Avatar
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    Quote Originally Posted by 2001NBMZ28 View Post
    GM extended the cat warranty to 10yrs/120K miles back in December for the '00-'02 cars here. Contact your dealer and see if it applies overseas too.
    Just to add note that That extended warranty does not apply to all cars.
    My car was only extended to 96mos/80k miles.
    I checked with the dealer and with GM using my VIN and got the same info both times.
    I know some cars got the 10/120k but not all of them.

    I had the 420 code and then started getting misfires and just went and got the rear o2's deleted and the egr deleted as it was faulty also.
    Now no problems and the cats are soon to be gutted as soon as I can persuede myself to crawl under there again.

  6. #6
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    The 8yr/80K cat and PCM warranty wasn't an "extended" warranty - they fall under the original Federal Emissions Warranty. Don't know why they turned you down.

  7. #7
    Member firemedic0135's Avatar
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    Quote Originally Posted by 2001NBMZ28 View Post
    The 8yr/80K cat and PCM warranty wasn't an "extended" warranty - they fall under the original Federal Emissions Warranty. Don't know why they turned you down.
    I dont know either.I think you are the one who sent me the letter advising it had been extended right?
    Anyway if it changes I'll let yall know.

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