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P0420

This is a discussion on P0420 within the Computer & Tuning forums, part of the LSx Technical Help Section category; ok I replaced my o2's and now I get the P0420 code (which I think its fine since I have ...

  1. #1
    Senior Member Justin23454's Avatar
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    1998 Trans Am

    P0420

    ok I replaced my o2's and now I get the P0420 code (which I think its fine since I have gutted cats). Am I assuming correctly? Just need to get my comp tuned now right?

  2. #2
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    P0420 and P0430 are cat inefficiency codes from the rear 02 sensors, if you've gutted the cats have them turned off. Ask your tuner about other cat related tuning too, like COT.

  3. #3
    Senior Member Justin23454's Avatar
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    SOM
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    ya I have not had anything done to my car after my mods. I know I need to though gonna do it really soon. Probly send to frost or something.
    SLP lid, SLP CAI, K&N air filter, Ac Delco Iridium plugs, Gutted Cats, QTP 3'', TB Bypass, LT headers w/ORY,

  4. #4
    TunedbyFrost.com Tuner Frost's Avatar
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    or drive over here and put it on the rollers; whichever you'd prefer... UPS (and FedEx most likely) is overnight between us shipping via ground, so that's nice.

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