I've found that you can get that check engine light to go off for a little while if you unhook the battery for 5 minutes. Usually gets rid of the "check Engine" worry for at least 5 or 10 miles....before it comes back on again. By the way, the most common reading on the little tool that tells you why the check engine light is on is "cylinder misfire". A lot of times spark plugs and plug wires takes care of the problem. Except the car manufacturers usually put at least one of those spark plugs back where only a mouse can get to it........