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

I have noticed a rattling noise coming from the engine of my Audi A2. It seems to be getting louder and more frequent. What could be causing this and what should I do about it?

This could be a sign of an issue with your engine's timing chain. It is important to have this checked by a mechanic as soon as possible to prevent further damage.

It is also possible that the noise is coming from a loose or worn out belt. Have a mechanic inspect your belts and replace them if necessary.