Why is the Audi A7's engine making a strange noise?

I recently noticed that my Audi A7's engine is making a strange noise while idling. It's not very loud, but it's definitely noticeable and I'm worried it might be a sign of a bigger issue. Has anyone experienced this before? What could be the cause and how can I fix it?

It could be a sign of a worn out belt or a faulty tensioner. I had a similar issue with my A7 and that's what it turned out to be.

I had a similar issue with my A7 and it turned out to be a faulty exhaust manifold. You should get it checked by a mechanic as soon as possible.