What are common reasons for an Audi's check engine light to come on?

I recently experienced my Audi's check engine light turning on and I'm not sure what could be causing it. What are some possible reasons for this issue and how can I address it?

The check engine light can come on for a variety of reasons, from simple issues like a loose gas cap to more complex issues with the engine. It's important to get the car diagnosed by a certified mechanic to determine the exact cause.

One common reason for the check engine light to come on in Audi cars is a faulty oxygen sensor. This can cause a decrease in fuel efficiency and could potentially damage the catalytic converter if left unresolved.