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P0420 code


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I have a 2002 Silverado LS extended cab, RWD, 4.8 truck with 170k miles. While driving home yesterday, the service engine soon light came on steady on the dash. I took it to Autozone to have it the OND II read. The tech at autozone said it has a P0420 code, which indicates a problem with the emissions system. 

 

Any advise before I start changing parts?  

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A loose O2 sensor can cause this code.  Very rarely it is a bad sensor.  Eliminate that by swapping sides and see if a P0430 gets thrown.  

 

It's probably a cat and if so, stay away from the Chicom ones as they will barely last a year or so.

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