Question about 2003 Pontiac Grand Prix
2003 Pontiac Grand Prix service engine light on, pep boys said needed it new catalytic converter and o2 sensors. Got new cat and o2 sensors. Light has continued to come on even after they have reset 4 times. I have driven an hour at highway speeds as recommended for a new cat. What could be issue?
I wouldn't have gotten a cat. If the o2s are all replaced, then it could be an EGR valve
Posted on Oct 06, 2009
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Posted on Jan 02, 2017
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