Chev S-10 Service Engine Light w only 16000 mi

Well you could take it some where and have the codes pulled. 5 year old truck with only 16,000 miles, thats just over 3,000 a year. Gas doesnt last for ever it does go bad. If your going to let it sit that much start using a fuel stablizer, or maybe its time to part with it as it sounds like its a very seldom used second vehicle. Whitelightning

And there isn't a code for "bad gas". The parts store will either confuse him further, or sell him stuff that doesn't solve the problem. Unfortunately, the dealer is probably his best option...unless he's experienced.

There's no reason to think it's bad gas. That was just an unfounded assumption made by the dealer on a phone call.

Thanks again to all that offered help. An auto parts Dealer read the code as a bad oxgen heater sensor. Purchased OEM part and had it intalled, fixed problem. I am still disappointed that GM would not do some adjustment on the warrenty but they refused. Ross