PO420 code

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Oct 4, 2010 | 09:35 AM

Allgood Customs

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From: Broomfield Colorado

PO420 code

so the other day I was driving and my check engine light came on. It's saying that PO420 is the code. Does anyone know of this code and if so how can I fix it. Thanks

Oct 4, 2010 | 09:39 AM

starkiee06ss/sc

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From: albany NY

im like 90% sure thats the code that pops up for the o2 sensor. it will pop up if your catless. its nothing bad.

Oct 4, 2010 | 09:40 AM

Chevycobaltss3

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From: Vine Grove Kentucky

Cat low efficincy bad cat or bad rear 02 sensor

Or leak in the exaust

Last edited by Chevycobaltss3; Oct 4, 2010 at 09:40 AM. Reason: Automerged Doublepost

Oct 4, 2010 | 09:41 AM

Chevycobaltss3

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From: Vine Grove Kentucky

And if u are catless there u go get tuned bro.... Ure parts are not even giving you ure full potential till ure tuned for them and the tuner can delete the code

Oct 4, 2010 | 09:42 AM

383_Stroker

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From: Murray, KY

Quote:

Originally Posted by Chevycobaltss3

Cat low efficincy bad cat or bad rear 02 sensor

Or leak in the exaust

Yeah that

Oct 4, 2010 | 09:53 AM

Allgood Customs

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From: Broomfield Colorado

yeah well it does have a cat on it, but there could be a leak. If so would it be where the header meets the downpipe, because that's right before the o2 sensor