Why is my Audi A2's engine making a strange rattling noise?

I've noticed a strange rattling noise coming from under the hood of my Audi A2. It seems to happen only when I accelerate and gets louder the faster I go. Any idea what could be causing this?

It's possible that there is an issue with your engine's timing chain. This could be caused by wear and tear or low oil levels. I recommend having it inspected and repaired by a qualified mechanic as soon as possible to avoid any potential damage to your engine.