What are the common causes of a check engine light in the Audi A3?

I noticed that my check engine light has turned on in my Audi A3. What are some possible reasons for this and what should I do?

The check engine light can often indicate an issue with the oxygen sensor. I recommend taking your car to a mechanic to have it checked and replaced if necessary.

An issue with the catalytic converter can also trigger the check engine light. Make sure to have it inspected and replaced if needed.

Sometimes, a loose gas cap can also cause the check engine light to come on. Check and tighten your gas cap before taking it to a mechanic.