The best way to Manually Reset the Service Engine Light in a BMW 3 Series

    1

    Put the important into the ignition and turn the vehicle for the "on" position but don't start out the engine.
    2

    Find the diagnostic port below the driver's side dashboard close to the pedals Professional diagnositic tools. Plug the computerized scan tool into this port. The battery in the car will automatically power on the tool.
    3

    Find arrows on the faceplate of the scan tool and use them to scroll through the menu until you come across the "Read All Codes" command. Select this command.
    4

    Scroll through the menu again and obtain "Clear All Codes." Select this option then wait for the service engine light to shut off.
    5

    Turn off the car and wait five minutes Auto tools. Start the engine and verify that the check engine light is still off.