What causes a rattling noise when driving my Audi 80?

I recently noticed a rattling noise coming from my Audi 80 while driving. What could be causing this and how can I fix it?

The most common cause of a rattling noise while driving is a loose or worn out exhaust system. Check the exhaust system and tighten or replace any parts as necessary.

Another possible cause could be loose or damaged heat shields. Inspect the heat shields and secure or replace them if needed.