How to fix the check engine light in an Audi A3?

My check engine light has turned on in my Audi A3. Is there something wrong with my engine or is it just a malfunction? I'm not sure what to do.

First, don't panic! The check engine light can come on for a variety of reasons, some more serious than others. It's important to get your car checked by a professional as soon as possible, but don't stress out just yet.

The first thing to do is check your gas cap. If it's loose or damaged, it can cause the check engine light to come on. Tighten it or replace it if necessary and see if the light goes off.