How do I fix the check engine light in my Audi A4?

I recently had the check engine light turn on in my Audi A4. What could be causing this and how can I fix it?

The check engine light can be triggered by a variety of issues, from a loose gas cap to a more serious engine problem. I recommend getting a diagnostic test done at an Audi dealership or trusted mechanic to pinpoint the exact cause.

I had a similar issue with my Audi A4 and it turned out to be a faulty oxygen sensor. Getting the sensor replaced resolved the issue and turned off the check engine light.