1. Ensure the issue that caused the CEL to illuminate has been resolved. If not, resetting the CEL will only cause it to reappear soon after.
2. Locate the OBD-II port in your car. It is typically found under the dashboard, near the driver's side footwell.
3. Turn the ignition on but do not start the engine.
4. Using an OBD-II scanner or a code reader, connect to the OBD-II port. These tools are widely available for purchase or rental at auto parts stores.
5. Follow the instructions on the OBD-II scanner or code reader to retrieve and clear any diagnostic trouble codes (DTCs) that are stored in the car's computer. Clearing these codes should turn off the CEL.
6. Disconnect the OBD-II scanner or code reader from the port.
7. Start the engine to verify if the CEL has been reset. If the light stays off, the reset was successful.
If the CEL persists, it is recommended to have a qualified mechanic diagnose the underlying issue and perform any necessary repairs. The CEL is designed to indicate the presence of an engine or emissions-related problem that needs attention.
