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

Every time I start my Audi A4, I hear a loud rattling noise. It goes away after a few seconds but it's concerning. Could this be a sign of a serious engine problem?

This rattling noise could be a result of a worn timing chain or tensioner in your engine. It's important to have it checked by a qualified mechanic to avoid any further damage.

Another possible cause for the rattling noise could be a issue with your engine's oil pump. It's best to get it inspected and replaced if necessary.