What causes the check engine light to come on in an Audi A2?

I've noticed that my check engine light has been coming on in my Audi A2. What could be causing this and how can I fix it?

One common cause of the check engine light coming on in an Audi A2 is a faulty oxygen sensor. This can affect the car's performance and fuel efficiency. I would recommend getting it checked and replaced if necessary.

Another potential cause is a loose or damaged gas cap. This can trigger the check engine light to come on. Double check your gas cap and make sure it is properly tightened or consider replacing it.