Why does my Audi A3's engine make a ticking noise at idle?

I recently noticed that when my Audi A3 is at idle, there is a ticking noise coming from the engine. It goes away when I rev the engine or when I am driving. What could be causing this?

This ticking noise could be caused by a number of issues, including a faulty camshaft position sensor or a worn timing chain. I suggest taking your car to a certified mechanic to check for any potential issues.