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SES codes

This is a discussion on SES codes within the General Help forums, part of the LSx Technical Help Section category; ok, i gutted my cat that was giving me troubles and passed inspection because I knew the guy now i ...

  1. #1
    Member adham's Avatar
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    SES codes

    ok, i gutted my cat that was giving me troubles and passed inspection because I knew the guy
    now i get the code PO420 catalyst efficiency below threshold
    this is normal right?
    does this mess up my car's performance in any way??
    thanks

  2. #2
    Member adham's Avatar
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    also, which side is bank 1?

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    Veteran 0rion's Avatar
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    Right, 420 is just a cat code and don't hurt anything. Bank 1 is the drivers side.

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    Life in the Fast lane sunsetorangess's Avatar
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    Yepp im thinkin its bc you gutted your cats, The rear 02 sensor is pickin up that your "cat is bad" so its throwin a trouble code. Shouldnt run any differently thou.
    J
    2001 SS, Its not the car its the Driver that matters....

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
    00 Black Ram Air Trans Am

    Get someone with a tuner to remove the code

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    Member adham's Avatar
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    damn, i only gutted the passenger cat and it says that the driver's cat is the one thats messed up.
    Should i go ahead and gut that one too?

  7. #7
    Life in the Fast lane sunsetorangess's Avatar
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    Lol thats weird, Why did you only gutt one cat? I would go ahead and gutt the catt and too get rid of the code i would either get it deleted out or pick up some sims too get rid of the light...
    J

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    That is weird, you'd think it would just throw P0430, maybe it's because you only gutted one???? Gut the other one and get sims or all postcat 02 codes turned off.

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    Member adham's Avatar
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    im gonna gut the one that is throwing the code but not right now
    if i leave it for a while will it cause anything to decrease my performance?
    i know i already asked the question but that is when i thought the code was from the one i gutted!! lol

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    I gutted both of my cats and i kept getting the SES light so i had someone just delete the code completely. No SES light after that

  11. #11
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    Cat inefficiency codes, regardless of which bank, won't hurt performance if they're gutted.

  12. #12
    Member adham's Avatar
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    Quote Originally Posted by 2001NBMZ28 View Post
    Cat inefficiency codes, regardless of which bank, won't hurt performance if they're gutted.
    correct, but my drivers side cat is not gutted and its the one giving the code.
    thanks everyone for the input

  13. #13
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    mystic
    95 LS, yes it says LS

    only haveing one gutted wont let bothbanks breath the same. Don't see how it could hurt, but can't be good. I'd gut the other ASAP.

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