What are the symptoms of a faulty oxygen sensor in an Audi 80?

I suspect my oxygen sensor may be malfunctioning in my Audi 80. What are some common symptoms of a faulty sensor and what do you recommend I do?

The most common symptoms of a faulty oxygen sensor in an Audi 80 are decreased fuel efficiency, rough idling, and the Check Engine light appearing. If you suspect your sensor may be faulty, it is important to get it replaced as soon as possible to avoid further damage to your engine.

In addition to decreased fuel efficiency and rough idling, a faulty oxygen sensor can also cause your Audi 80 to fail emissions tests and have a poor performance overall. I would recommend getting your sensor tested and replaced if necessary by a qualified mechanic.