Why does my Audi A1's engine make a rattling noise on start up?

I have noticed that my Audi A1's engine makes a rattling noise every time I start it up. It lasts for a few seconds and then goes away. What could be causing this and should I be concerned?

This could be a sign of a loose timing chain or worn tensioner. It is recommended to have a mechanic take a look at it to avoid potential engine damage.

It is common for Audi engines to produce a slight rattling noise on start up. However, if the noise is excessive or persists, it is best to have it checked out by a professional.