Why is my Audi A3 producing a strange noise under the hood?

I recently noticed a strange noise coming from the engine of my Audi A3, even when it's at idle. What could be causing this and how can I fix it?

This could be caused by a faulty pulley or belt in the engine. I recommend taking your car to a certified mechanic to have it checked and replaced if necessary.

Check your oil levels and make sure they are at the recommended level. Low oil can often cause strange noises in the engine.