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The average cost for a Check Engine Light Diagnosis is between $88 and $111. Labor costs are estimated between $88 and $111. Estimate does not include taxes and fees. Get a Personalized Estimate.
Old spark plugs. If the car's past 100,000 miles and the spark plugs or plug wires haven't been replaced, it might be time. Run your own diagnostic. Having your service tech read the engine code off your car's computer, which will ID the problem that triggered the light, could cost you about $75.For about the same price, you can buy your own OBD-II scanner.It'll tell you what the problem is and give you a shot at fixing it yourself.aving your service tech read the engine code off your car's computer, which will ID the problem that triggered the light, could cost you about $75. For about the same price, you can buy your own OBD-II scanner.