2006 Chevrolet Cobalt Q&A
2006 Chevrolet Cobalt Question: The check engine light is on, but there doesnn't seem to be a problem otherwise.
there is a code its just not a hard code that keeps the light on. have code read and post so we can adv. - globalhelper
If your gas cap is not on tightly this will cause check engine light to come on. I found this out from my mechanic. This happened after I went to a full service gas station and I remember not hearing that distinctive crank sound when he put my cap back on but didn't think nothing of it until an unusually cold snap in weather happened that evening (which can also trigger this light) made it go on so I turned my gas cap tighter and the light went off. - karen496