How can I troubleshoot a faulty starter in my Audi A2?

I've been having trouble starting my Audi A2 and suspect a problem with the starter motor. How can I diagnose and fix the issue?

First, check the battery and connections to ensure they are not the source of the issue. If all is well, inspect the starter motor and its wiring for any damage or corrosion. You may also want to test the voltage at the starter solenoid. If everything looks fine, you may need to replace the starter motor.

Before replacing the starter motor, try cleaning and lubricating the starter gear and flywheel. It's possible that buildup or lack of lubrication is causing the motor to struggle. Also, check for any loose bolts or connections that may be affecting the starter's performance.