How to fix a rattling noise in the Audi 80 engine?

I've noticed a loud rattling noise coming from the engine of my Audi 80. It seems to happen mostly when the car is idle and gets louder as I accelerate. What could be causing this and how can I fix it?

First, check the oil level and make sure it's at the recommended level. Low oil can cause engine noises. If the oil level is fine, it could be a problem with the timing belt or tensioner. Have a mechanic inspect these components and replace if necessary.

Another possibility is that the heat shield on the exhaust system has become loose. This can cause a rattling noise when the car is in motion. A good mechanic should be able to easily identify and fix this issue.

It's also possible that the noise is coming from the pulleys or bearings in the engine. Have a mechanic inspect these components and replace any worn out parts.