Question about Pontiac Sunfire
Well first is the check engine light on. Egr will set a code if it is working or not. Possible cat but could be a front O2 sensor causing the vehicle to run too rich. The best thing is to run a scan to see if there are any codes and they can see if the O2 sensors are work and even check the Mass Air Flow sensor too. Good luck.
Posted on May 18, 2011
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Posted on Jan 02, 2017
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