How to Reset the Check Engine Light on an Audi

1. Park the Audi on level ground.
2. Place the OBD diagnostic tool or scanner into the Audi's OBD II interface, which is located behind the hood release on the driver's side of the Audi, inside of the vehicle. Reach underneath the dashboard to get better access to the interface. The OBD II interface is also known as the diagnostic port.
3. Wait for the display on the tool to display the reasoning for the engine light and for the check engine light to be reset.
4. Remove the tool from the Audi.