How can I troubleshoot and fix a persistent check engine light on my Audi 80?

I have a 2007 Audi 80 and the check engine light keeps coming on, even after I have addressed previous issues. What could be causing this and what steps can I take to resolve it?

First, make sure to check the fuel cap. A loose or faulty fuel cap can trigger the check engine light. If that doesn't solve the issue, have the car scanned for error codes to pinpoint the issue.

A common issue in Audi 80s is a faulty oxygen sensor. This can cause the check engine light to come on and also affect the car's performance. Have a mechanic check and replace the sensor if needed.