How to troubleshoot an issue with the Audi A4's timing belt?

I recently noticed that my Audi A4 is making some strange noises and I suspect that it may have something to do with the timing belt. How can I troubleshoot this issue and what steps should I take to fix it?

First, you should inspect the condition of the timing belt itself. Look for any signs of wear or damage, such as cracks or missing teeth. If the belt is in good condition, the issue may lie elsewhere.