To disable the service engine light in a vehicle, use a scan tool, or disconnect the car's battery. It is easier and safer to use a scan tool, though without one, the process generally takes 20 to 30 minutes.Continue Reading
Follow the manufacturer's directions if using a scan tool. A scan tool typically requires a connection to the vehicle's on-board diagnostics data link connector. If a scan tool is not being used, disconnect the positive battery cable from the battery terminal.
Briefly turn the ignition switch on and off three times while the battery is disconnected. Leave the battery disconnected for 5 to 10 minutes.
Carefully reconnect the positive cable to the battery terminal. Be sure the vehicle's ignition is turned off during this step as there is a risk of electrical damage to the emission components.
Turn the vehicle's ignition on, and wait a full minute before starting the vehicle. Upon starting the car, the check engine light should be turned off. If using a scan tool, ensure that it is disconnected from the data link connector before starting the vehicle.