Why does my Audi A7's engine make a rattling noise when starting up?

Whenever I start my Audi A7, the engine makes a rattling noise for a few seconds before quieting down. Is this something to be concerned about?

It's likely that the rattling noise is caused by a loose belt or a worn pulley. I would recommend bringing it to a mechanic to have them inspect and potentially replace these components.

It could also be a sign of low engine oil. Check your oil levels and top up if necessary. If the noise persists, it's best to have a professional take a look.