I didn't do anything aftermarket when it first came on, but I did change the cabin air filter shortly before it happened. I also changed the O2 sensor, and opened up the center console. I have checked the connections in all of those areas, but feel one of those repairs was the culprit. Any ideas? I need to sell my car, and I know it will hurt the value with that light on.

 

hate to say it take it in to the dealer and pay for their diagnostic fee and go from there

 

hard to say