How to troubleshoot a faulty starter in an Audi A2?

My Audi A2 is having trouble starting up and I suspect the starter might be at fault. How can I diagnose and fix this issue to avoid costly repairs?

You can start by checking your battery and ensuring it is fully charged. A weak or dead battery can cause issues with the starter.

If the battery is not the issue, you can try tapping the starter lightly with a hammer while someone tries to start the car. Sometimes this can jolt the starter and get the engine running.