Turn the ignition OFF.
Locate the vehicle’s OBD-II port (usually under the dashboard near the steering column).
Plug an OBD-II scan tool into the port.
Turn the ignition to ON (engine OFF).
Use the scan tool to select “Read Codes” and “Clear/Erase Codes.”
Confirm the codes are cleared.
Turn the ignition OFF, then ON again to verify the light is off (or that codes no longer return).
If you don’t have a scan tool, disconnect the negative battery terminal for 10–30 minutes, then reconnect and start the engine.
After clearing/resetting, drive the vehicle for a short period (or complete a normal drive cycle) to allow the system to re-check emissions.
If the check engine light returns immediately, read the codes again and address the underlying issue.