How can I troubleshoot a faulty starter on my Audi A6?

I recently replaced the battery on my Audi A6, but now the starter seems to be malfunctioning. When I turn the key, the engine won't start and I can hear a clicking sound. Are there any steps I can take to troubleshoot this issue?

First, check all the connections to the starter and make sure they are secure. Corrosion or loose connections can cause issues with starting the engine. If everything looks good, try tapping on the starter with a hammer or wrench. Sometimes this can jostle the internal components and allow it to work again.