How to diagnose and fix Audi A2 electrical issues?

I've recently been having some electrical issues with my Audi A2, such as flickering headlights and a fluctuating battery gauge. I've tried replacing the battery, but the issue persists. What could be the underlying issue and how can I fix it?

It's possible that there is a faulty ground connection causing the electrical issues. You can try cleaning and tightening all the ground connections to see if that helps. If not, you may need to consult a professional mechanic to diagnose the issue further.

I had a similar issue with my Audi A2 and it turned out to be a faulty alternator. I had it replaced and haven't had any electrical problems since. I would recommend getting your alternator checked by a mechanic to see if that's the issue.

Another potential issue could be a faulty voltage regulator. This can cause the fluctuating battery gauge and other electrical problems. Have a mechanic check the voltage regulator and replace it if necessary.