Chevrolet Silverado P Codes (Powertrain) P0400 - P0499 P0420

Browse Chevrolet Silverado P Codes (Powertrain) P0400 - P0499 P0420 questions and answers. Choose a question that matches your symptoms.

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Code P0420 How Do I Fix?

2004 CHEVROLET SILVERADO

I Had A Tech Hook Up The Machine And He Gave Me This Code.... P0420. He Said It Was Catalyst Or The O2 Sensor....can U Help Me

6 ANSWERS

Asked by mike espinoza

2004 CHEVROLET SILVERADO

This Code Keeps Coming Up And We Are Running Out Of Ideas How To Fix It. Convertor Is Less Than A Year Old And Seems To Be Okay. O2 Sensor...

4 ANSWERS

Asked by psbowler

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