Check engine light and ECU codes should only be cleared after repairs are completed. Do not clear the codes without fixing the problem.
What you will need
- Turn on the ignition, but do not start the engine.
- Plug the scanner into the OBDII port. The OBD-II port is right under the dashboard, on the driver's side.
- Scroll down to Clear Codes. Press OK
- Cycle the ignition off and wait for five seconds.
- Turn the ignition back on and start the engine. The car should start, and the check engine light should be off.
Can I reset Mitsubishi check engine light by disconnecting the battery?
Yes. If you disconnect the battery for at least fifteen minutes, the fault codes stored in the engine control unit (ECU) will reset. We do not recommend this method because you will not know if there are any other issues present or what is wrong with the vehicle.
Do I need a scanner to clear Mitsubishi codes?
In theory, you do not need an OBD-II scanner to clear the codes. If you fixed the problem and there is no other issue with the vehicle, the check engine light will reset on its own.
It will take about three to four days or normal commuting for the light to reset on its own. The check engine light doesn't reset immediately unless you are using an OBD-II scanner.
There are hundreds of possible problems that can cause the check engine light on your Mitsubishi to stay on. The most common issues are spark plugs, oxygen sensors, and catalytic converter failure. Instead of guessing what is wrong, use an OBD-II scanner to read the fault codes.