Easiest way is with a Diagnostic Scanner connected to the OBDII port usually under the dash but easilly visible from underneath the dash and usually on the driver side. Location can vary from car to car.How about on a 1995 Oldsmobile Aurora?
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An engine code reader tool is needed to read a vehicle's engine trouble codes. Most auto parts store have them available and they can check the code for you by plugging it into your vehicle's OBD...