iversonhof
Junior Member
I've searched this forum and other forums. A 2006 cobalt with 67000 miles completely plain no aftermarket stuff at all. I have a check engine light with code reading P0300. Is there certain things to check in a certain order? One thread I read said there could be up to 10 things wrong with the car with that code. I've seen coils, cat, to bad plugs! The car acts normal with just the check engine light on. The old owner said he purchased it at 16000 miles and the check engine light has been on ever since. Any help would be greatly appreciative.