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Saint Petersburg, FL
My son's car has a ck engine light on (the car is running great in every respect). We brought it to a car parts store who looked up the code using obd 1 diagnostics. The owner of the store said it was a code 12 (something to do with rpm signal not responding to engine). We disconnected the negative side of battery for 18+ hours, but light still comes on. Can you suggest any other solution?