Why does my Audi A6 engine make a rattling noise upon startup?

I have noticed that my Audi A6 2.0 TFSI engine makes a strange rattling noise when I start it up in the morning. The noise usually goes away after a minute or two. What could be causing this issue and is it something I should be concerned about?

The rattling noise upon startup could be due to a loose or worn out timing chain. It is a common issue in Audi A6 models and should be addressed by a mechanic as soon as possible to prevent further damage to the engine.

Another possible cause of the rattling noise could be a faulty valve lifter. This can be a costly repair, so it's important to get it checked by a trusted mechanic to avoid any potential long-term damage to the engine.