Having problems with your 2002 Pontiac Grand Am ?
I have a 02 grand am , my 2.2 litre engine light came on. after useing a code reader on it, it came up with a po420 1/2 reading. what does this indicate ?
Code P0420 indicates a problem with the efficiency of the catalytic converter.
Repair Help & Product Troubleshooting for 2002 Pontiac Grand Am
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