Why does my Audi A3 display a 'check engine' light?

I've noticed that the 'check engine' light on my Audi A3 is constantly on. What could be the cause of this and how can I fix it?

The 'check engine' light usually indicates an issue with the engine or emissions system. It would be best to take your car to a certified mechanic to diagnose and fix the problem. In the meantime, make sure to check your gas cap to ensure it is tightly sealed as a loose cap can trigger the light.

One common reason for the 'check engine' light on Audi A3s is a faulty oxygen sensor. This can affect fuel efficiency and emissions. It is important to get this fixed as soon as possible to prevent further damage to your car.