P0420 SES light code.....cutout?
Thread Starter
Teching In
Joined: Feb 2004
Posts: 25
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P0420 SES light code.....cutout? My SES light came on the other day and went down to autozone and had them scan it. The code was a P0420 which has something to do with the Cat or O2 sensor on the drivers side. Not sure which the problem is so I bought the sensor but haven't installed it yet. I've seen some people saying the Cats are under warranty for 8years/80Kmiles. Will the dealership still replace my Cat for free even though I have a cutout in my I pipe? Or are they going to screw me?
