Engine Performance problem
2004 Pontiac Grand Am 4 cyl Front Wheel Drive Automatic 114000 miles
My 2004 Grand Am has a P0420 code. I replaced the O2 Sensor that is in the exhaust manifold. The dealership told me that was Bank 1. This did not fix anything. Do you have any ideas on what the fix would be?
have the same problem?
Thursday, July 24th, 2008 AT 12:18 PM