Why is my Audi A6's engine making a tapping noise?

I've noticed that my Audi A6's engine has started making a tapping noise recently. What could be causing this and how can I fix it?

It's possible that the tapping noise is coming from the valves. This could be caused by dirty or worn out parts. I recommend getting your car serviced and having the valves cleaned or replaced.

Another possible cause could be low oil pressure. This can also cause a tapping noise in the engine. Check your oil levels and get an oil change if needed.