Why is my Audi A3 displaying the check engine light?

I just noticed that the check engine light has turned on in my Audi A3. What could be the cause of this and how should I address it?

The most common reason for the check engine light to turn on in an Audi A3 is due to a faulty oxygen sensor. It is important to get this checked and replaced as soon as possible to avoid further damage to your vehicle.

Sometimes the check engine light may also come on due to a loose gas cap. Check and secure the gas cap properly and see if the light turns off. If not, have a mechanic check for other potential issues.