engine code????????????????????????????/
Thread Starter
Joined: Oct 2006
Posts: 30
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engine code????????????????????????????/
so I just got a high flow resenator along with a catback exhaust and a day later my check engine light pops up with the code P0420 (M) 1/1 Catalytic Converter Efficency Catalyst 1/1 efficency below required level anyone know why???????thanks
Veteran
Joined: May 2006
Posts: 446
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From: Riverside
RE: engine code????????????????????????????/
Thats wierd, have you checked you O2 sensor's, maybe they went bad. I run a cat delete when I go racing with my 04 SXT and the light has never come on. Have you tried to clear the code by disconnecting the battery for a while and does it come right back on? If you haven't try that then maybe replace the O2 sensor.