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Estimator » Check Engine Light Diagnosis

Check Engine Light Diagnosis Cost




$88 to $112
National Average
Estimate includes:


Best Practices
  • A Check Engine Light is turned on when the engine control module detects a fault in the emissions system. One or more diagnostic codes will be stored in the engine module. These codes are just one piece of information the shop will use to diagnose the problem. Each code has a diagnostic procedure that must be followed to properly identify the problem.

  • Some vehicles may display this warning light as the SES (Service Engine Soon) or MIL (Malfunction Indicator Light).

  • Determining the cause of why a check engine light is on can be very difficult, but the initial estimate should fall within the RepairPal range. However, if additional diagnoses time is needed, this will add to the original estimate. The customer should be contacted and receive an explanation before authorizing additional charges. 

Common Symptoms
  • When the Check Engine Light comes on, you may experience engine performance issues such as poor acceleration, rough idling, and an engine that won't start. In some cases, no abnormal symptoms will be experienced. Whether you experience performance problems or not, a flashing CEL indicates that an engine misfire has occurred. If you continue to drive the vehicle, you may damage the catalytic converter.

» Learn more about Check Engine Light Diagnosis