Engine light on in 09 pontiac g6

10

Asked by Sep 23, 2013 at 07:32 PM about the 2009 Pontiac G6

Question type: Maintenance & Repair

I have a 2009 Pontiac G6 (4 cylinder) that has the engine light turned on. I went to an auto parts store and they told me the catalyst efficiency had a low bank because the o2 sensors monitor the catalytic converters ability to store oxygen and the possible causes were the catalytic converter was defective due to engine misfire or running condition, there's a large vacuum leak, or the engine oil leakage into exhaust-valve guide seals, piston rings. I have no idea what any of it means, if anyone could guide me in the right direction, I would really appreciate it. Thanks.

3 Answers

232,055

Having the 4 digit code would better help us. The tech is partly right, but having the code will tell us which O2 sensor is detecting the problem. Do you have a misfire? The codes would tell us which coil was the problem and if you have a vacuum leak as well. Post the code or codes and we'll get back to you.

10

The troubleshooting code is P0420

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3,765

ritzy24, If you are still having concerns and would like for your GM dealership to look into this further, please let us know. You can email us at socialmedia@gm.com. Erica Tiffany GM Customer Care

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