An O2 sensor is a vital part of the emission control system of a vehicle. Its sole purpose is to assist the ECU in regulating the air-fuel ratio within the engine cylinders. A faulty O2 sensor can bring your Audi to a halt and leave you stranded in the middle of the road. So, if you're discovering signs of O2 sensor failure in your Audi, then consider replacing it.
https://www.youtube.com/watch?v=JPxiOk-OYKg
https://www.youtube.com/watch?v=JPxiOk-OYKg
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