Why is my Audi's engine making a loud clicking noise?

I've noticed that my Audi's engine has been making a loud clicking noise recently. It only seems to happen when I first start the car, but it's quite concerning. What could be causing this and how can I fix it?

It's possible that the clicking noise is coming from the valves in your engine. This can be caused by wear and tear or a lack of proper lubrication. I would recommend taking your car to a trusted mechanic to have them inspect and potentially replace the valves if necessary.