Why does my Audi's engine keep making loud noises?

I'm noticing that my Audi's engine is making unusually loud noises. It's been happening consistently for the past week. What could be the potential causes and how can I address this issue?

First, it's important to identify the type of noise your engine is making. Is it a knocking, squealing, or rattling sound? This can help narrow down the potential causes. It could be something as simple as a loose belt or a more serious issue like a worn piston ring.