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Old 01-30-2005, 05:36 PM   #1
USA1
Scooby Newbie
 
Member#: 33390
Join Date: Feb 2003
Location: A Spider Hole
Default Question about CATs and P0420 CEL

The P0420 CEL seems pretty common. In the CEL thread some people thought it could be an O2 sensor problem and not always a bad CAT.

Has P0420 ever been the result of a bad O2 sensor, or is my CAT the problem?

I've had a turboback with a hi-flow cat in the DP (on an '02 WRX) for close to 30K miles and just got this CEL. Do CATs go bad that fast?
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