How to troubleshoot a faulty starter in an Audi A3?

I have been having issues with my Audi A3's starter and it seems like it is not functioning properly. What steps should I follow to diagnose and fix this issue?

First, check the battery connection and make sure it is secure. If the connection is loose, tighten it and try starting the car again.

If the battery connection is fine, then the starter motor itself may be the issue. You can test this by tapping on the starter with a hammer while someone else tries to start the car. If the car starts, then the starter motor is most likely the problem and will need to be replaced.

Another common culprit for a faulty starter in an Audi A3 is a bad solenoid. The solenoid is responsible for sending an electrical current to the starter motor. To check if the solenoid is functioning properly, use a multimeter to test the voltage at the solenoid. If you are not getting the correct voltage, then the solenoid needs to be replaced.