I'm considering buying a '92 Loyale in mostly good shape, but the Check Engine light is always on. Seller says a mechanic checked the fault code and it was "something that could be ignored, something about emissions" but didn't remember any details. Assuming this is all true, (seller is a divinity student, unless he's a compulsive liar) what emission-related problems would cause the light to go on and just how trivial could they be?
The car is an hour's drive from me so taking it to a mechanic is a bit of a pain at this point.
TIA