How to Troubleshoot an Audi Oxygen Sensor


1. Locate the OBD port next to the fuse box (on the left), down in the driver's-side foot well of the Audi.
2. Plug the power connector from the OBD scan tool into the open port next to the fuse panel.
3. Turn the ignition key to the "II" position, and wait for the scan tool to retrieve the trouble codes from the computer.
4. Read the display on the OBD scan tool. A reading of P1101, P1115, P1116, P1117, P1118, P1119, P1120, P1121 or P1122 indicates a problem with the oxygen sensor on your Audi.