Pontiac Grand Am P Codes (Powertrain) P0400 - P0499 P0420

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

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2004 Pontiac Grand Am Code P0420

2004 PONTIAC GRAND AM

Good Afternoon, My 2004 Grand Am Has A P0420 Code. I Replaced The O2 Sensor That Is In The Exhaust Manifold. The Dealership Told Me That...

1 ANSWER

Asked by forkliftbobby

2002 PONTIAC GRAND AM

P0420 Reads On My 2002 Pontiac Grandam V6. I Recently Had A Head Gasket Job Done (and Egr Valve And Thermostat And Catalytic Converter Put...

1 ANSWER

Asked by bridges2012

2001 PONTIAC GRAND AM

2001 Pontiac Grand Am 3.4l V6 P0420 Catalytic Efficiency Bank 1 Code Was Tripping Every 15 Miles. After Replacing The Thermostat Which...

4 ANSWERS

Asked by InvestWithDane

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