Why is my Audi A2's engine making unusual noises?

I have recently noticed that my Audi A2's engine has been making some unusual noises. It sounds like a rattling or grinding sound. What could be causing this and how can I fix it?

The unusual noises from your Audi A2's engine could be caused by a number of issues, including worn out bearings, loose pulleys, or even low engine oil. To accurately diagnose and fix the problem, it is recommended to take your car to a certified mechanic for a thorough inspection.

I had a similar issue with my Audi A2's engine and it turned out to be a loose serpentine belt. Getting it properly tightened solved the problem. However, it is always best to have a professional check it out to avoid further damage to the engine.