Why is my Audi A3's engine making a clicking sound?

I recently noticed that my Audi A3's engine started making a clicking sound while idling. It's not a constant sound and seems to be coming from under the hood. Any ideas on what could be causing this and how to fix it?

Hi Samantha, thanks for reaching out. The clicking sound could be caused by a variety of issues. It's important to have a professional mechanic take a look at your car to accurately diagnose the problem. It could be something as simple as a loose belt or a more serious issue like a worn out valve. Best of luck!