Why does my Audi A4's engine make a rattling noise?

I've noticed that my Audi A4's engine has started making a rattling noise, especially when I accelerate. What could be the cause of this and how can I fix it?

The rattling noise could be due to an issue with the timing chain tensioner. This is a common problem in Audi engines. It is important to get it checked and repaired as soon as possible to prevent further damage to your engine.

Another possible cause could be a problem with the exhaust system. If there is a leak or a loose component, it can cause rattling noises. Have a mechanic inspect your exhaust system to determine the cause.