Why does my Audi A6's engine make a rattling noise at idle?

I've noticed that my Audi A6's engine makes a rattling noise when it's idling. It seems to go away when I accelerate, but it's concerning. What could be causing this and how can I fix it?

It's likely that the rattling noise is coming from the engine's timing chain. This could be due to wear and tear over time or a lack of regular maintenance. I would recommend taking your car to a certified mechanic to have it inspected and potentially replaced if necessary.

Another possible cause of the rattling noise could be a loose heat shield on the exhaust system. This can happen from driving on rough roads or from normal wear and tear. It's important to get this fixed as soon as possible to prevent any further damage to the exhaust system.