Question

2010 Chevy Traverse V6 Check engine light on gave the code p0420

Answer 1

Hi there,

This code is for the bank 1 catalytic converter. In the US this is covered with an 8yr/80k mile warranty so it would be replaced at no charge through the dealer. Otherwise the rear O2 sensor data has to be watched to determine if the converter is actually bad, then the converter would have to be replaced to resolve the problem.