How to troubleshoot a faulty starter in an Audi A4?

I have been experiencing issues starting my Audi A4, and I suspect the starter might be causing the problem. How can I troubleshoot and fix this issue?

Before jumping to any conclusions, it is best to first perform a simple visual inspection of the starter. Check for any loose connections, frayed wires, or visible damage. If everything looks normal, then you can move on to the next step.

Next, you can test the starter by using a test light or multimeter. Connect the positive probe to the starter and the negative probe to the battery's negative terminal. If the light or multimeter shows a reading, then the starter is receiving power and may not be the issue.