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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.
The Check Engine Light Is On. If you vehicle's check engine light remains on constantly, and never goes off, there's a good chance that your vehicle has a faulty engine control unit. There are numerous reasons why a car's check engine light will remain on. The most common reason is a problem with the ECU. If you notice that your check engine light is always on, take your in vehicle in for service and request that they check the engine control unit. The Car Won't Start If your vehicle fails to start for no apparent reason, this is also a good indicator that there may be a problem with the ECU.