Question about 2002 Nissan Altima

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PO420 DTC code on 02 Nissan 2.5 Altima

I got this code on my vehicle with about 80k miles. I looked the code up and found it could be O2 sensors or exhaust leak. Being the O2 sensors are near the end of their life, I went and changed both of them ($100 for both). Took the car to an auto parts store and had the code cleared. Drove car and code came back. I'm wondering if the exhaust leak is the fault, cause I do have a possible area after the cat. converter. There is this braided mesh covering the exhaust that I'm thinking could be the leak. Or the other thing I'm looking at is the converter is bad because I monitor my oil consumption and the car seems to me, using to much oil cause I add more oil before 1k miles or so. I did take it to the dealership to have an oil consumption test but of course they said it was fine.
Hope to hear some good news from somebody.

Thanks Matt

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  • Matt Apr 27, 2009

    Well, I took the car to a good repair shop and I told him the code and he said yes its a bad cat. converter. So I took the car to the Nissan dealership to see if they could cover the repair because the converter is covered 8 years or 80k miles. But no luck with the greedy dealership and also made an claim at Nissan and it took them a week to tell me that they wouldn't help either. Goes to show you how they are willing to sell you the vehicle but not stand behind the product. So all you 2002 Nissan Altima owners beware of the cat. converter failing on you around the 80k miles.

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I found out the cat bein broken up and suckin into the fudgin pinstons....good luck everyone

Posted on Feb 04, 2010

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They replaced my cat under 8 years/80k miles warranty. It is mandatory. Federal emission law

Posted on Nov 03, 2009

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