To reset the 2015 Audi A3 service interval, please follow these instructions:
1. Start the engine.
2. Press the CAR button to access the service menu.
3. From the CAR menu select CAR SYSTEMS.
4. From the CAR SYSTEMS menu select SERVICING & CHECKS.
5. Select RESET OIL CHANGE INTERVAL and confirm.
6. Turn off the igntion.
7. Start the engine and verify the indicator has been reset.