How do I know if my Audi A2's alternator is failing?

I've noticed some electrical issues in my Audi A2 and I suspect that it might be due to a failing alternator. What are the signs to look out for and what should I do if my suspicions are confirmed?

If your dashboard warning lights start flickering or if your headlights become dimmer while driving, it could be a sign of a failing alternator. You should take your car to a mechanic immediately to get it checked.