How to troubleshoot an audi oxygen sensor

Written by alibaster smith
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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:

Things you need

  • OBD scan tool

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  1. 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. 2

    Plug the power connector from the OBD scan tool into the open port next to the fuse panel.

  3. 3

    Turn the ignition key to the "II" position, and wait for the scan tool to retrieve the trouble codes from the computer.

  4. 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.

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