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reoccuring P0420 code

This is a discussion on reoccuring P0420 code within the General Help forums, part of the LSx Technical Help Section category; Hi I'm new here.. i was hoping that someone could help me,, I'm getting a reoccuring P0420(left bank Cat converter ...

  1. #1
    Junior Member
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    reoccuring P0420 code

    Hi I'm new here.. i was hoping that someone could help me,, I'm getting a reoccuring P0420(left bank Cat converter below efficiency) I have a 2002 Trans -Am WS-6 Automatic, with A K&N air filter,and a header back exhaust with High flow cats,, I've changed both of the left side O2 sensors but that only made it worse.. the Exhaust has the bung spacers for the O2 sensors. I've been told that it could be the MAF sensor.. or the TEMP sensor could be at fault,, does anyone have any suggestions,,P.S. I still runs like a striped ass ape even when the light come on .

  2. #2
    Member Goldcuffs's Avatar
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    Silver
    2000 Trans Am

    You will never get that code to go away with high flow cats. Go to WS6store.com and get some O2 simulaters and that will fix it. Had the same problem.

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    ^^^True. Although I didn't think anyone sold O2 sims anymore. If you can't find sims, find a tuner to disable the cat converter codes.

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    Veteran 0rion's Avatar
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    having it tuned out is the best way to go anyhow......sims weren't real reliable. Like you've already observed....it won't effect your performance.

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    Junior Member Ain't Right's Avatar
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    Pewter metallic
    2001 Pontiac Trans Am

    Love how 420 code is for the exhaust...get rid of tyat K&N filter or you will have a MAF problem before long

  6. #6
    Veteran 0rion's Avatar
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    Quote Originally Posted by Ain't Right View Post
    Love how 420 code is for the exhaust...get rid of tyat K&N filter or you will have a MAF problem before long
    not necessarily.....I've ran a K&N for 12 years with zero problems with it. You have to know how to oil them and include cleaning your MAF as part of your routine maintenance which it should be K&N or not.

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