Disconnect the car battery: This will cut off the power supply to the car’s computer, causing its memory to reset and hopefully turn the check engine light off when the battery is reconnected.
Use a scan tool: These devices are designed to communicate with a vehicle’s computer system and retrieve diagnostic trouble codes (DTCs).
Fix the problem: If the check engine light is on, there is a reason why. Resolving the underlying issue is the best way of clearing the check engine light.
Remember that resetting the check engine light without addressing the underlying cause may not be a good idea, as it can mask a potentially serious problem. If the check engine light comes on again, have it checked out by a qualified mechanic as soon as possible.
Before you start, ensure you have the owner’s manual of the car. If not, you can search online for a copy. Always refer to the vehicle-specific instructions if they differ from the steps below.
