i agree with semtex as well. I had 2 dealerships mess my cobalt up cuz of spark plugs, they put in the wrong type, fried the o-ring on the valve cover and oil went all over the place and engine wouldnt start. I guess all u can do is try flushing that crap out and then put in other oil. Only thing i can think of, why the CEL would come on is maybe it didnt lube up a part good enough and something went wrong or maybe its not cooling parts good enough. Or could be something simple as in they didnt tighten a bolt or maybe the dip stick came out. Cobalts had a bad case of dipsticks poping out and it causes CEL to come on.
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