Replace the oxygen sensor in your Audi after 100,000 miles. The sensor monitors exhaust gases coming from the engine. It then sends this information to the on-board diagnostic computer, and the Audi's computer adjusts the air-to-fuel ratio. The optimum ratio in Audi vehicles is 14.7 parts air to 1 part gasoline. If this balance is not achieved, your Audi's "Check Engine" light will illuminate. But before replacing anything, you should understand how to troubleshoot the oxygen sensor.
- Skill level:
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Things you need
- OBD scan tool
Locate the OBD port next to the fuse box (on the left), down in the driver's-side foot well of the Audi.
Plug the power connector from the OBD scan tool into the open port next to the fuse panel.
Turn the ignition key to the "II" position, and wait for the scan tool to retrieve the trouble codes from the computer.
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.
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