What are the most common reasons for the check engine light to come on in an Audi?

I have noticed that the check engine light has come on in my Audi recently. I want to know the main reasons why this happens.

One of the most common reasons for the check engine light to come on in an Audi is due to a malfunctioning oxygen sensor. It is recommended to bring your car to a mechanic to have it properly diagnosed and replaced, if necessary.

Another common reason for the check engine light to come on is a loose or faulty gas cap. Make sure to tighten or replace the gas cap if this is the issue. If the light persists, it may be a different problem.