If you look around, usually in wholesale discount stores (I go tmine at National Wholesale Liquidators, but I'm not sure if they're a nationwide chain) you can get a tester to hook up to your engine computer to read error codes. They go for about 30 bucks, and they had them for most makes. It can read and clear the codes for you. If you have a Chilton/Haynes manual for your car, it has a section on how to use a voltmeter and ground wire to read the codes. You don't always need to go to a garage.
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