Why does my Audi A4 produce a loud clicking noise?

I've noticed that my Audi A4 is making a very loud clicking noise while driving and even when the engine is off. What could be the cause of this and how can I fix it?

The loud clicking noise could be caused by a number of issues, such as a loose exhaust pipe or failing spark plugs. It's important to have a mechanic take a look at your car to determine the exact cause.

I had the same issue with my Audi A4 and it turned out to be a faulty fuel injector. It's an easy fix, but you should address it soon to avoid any further damage.