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There are some auto parts stores that will 'loan' you an OBDIIcode reader. There is no substitute for listening to the car's onboard computer -- it could be something simple, or it could be a sign of something more serious. Get the facts first, don't go chasing symptoms.
yeah just next time the light comes on go to autozone and they will read the code for you. write the code(s) down and we can tell you more what it means.