How to Reset the Service Reminder on a 2001 Audi S4
1. Press and hold the 'reset' button on the right side of the instrument cluster. There are two buttons on the instrument cluster, one to the right of the speedometer, and one to the left.
2. Turn the ignition switch on. Do not start the engine.
3. Press and hold the button on the left side of the instrument cluster, next to the speedometer.
4. Release both buttons when the service reminder resets on the display.