What is causing my Audi 80 to make a ticking noise?

I recently noticed that my Audi 80 is making a ticking noise while idling. It seems to be coming from the engine area. What could be causing this noise and how can I fix it?

It is possible that your engine's timing belt or tensioner may need to be replaced. This can cause a ticking noise and should be addressed as soon as possible.

Another possibility could be a faulty valve lifter. This can also cause a ticking noise and can be corrected by replacing the lifter.