Why is there a rattle noise coming from my 2019 Audi A5 engine on cold start?

I have recently purchased a 2019 Audi A5 and noticed a strange rattle noise coming from the engine when starting it in colder temperatures. It goes away after a few minutes of driving. Is this something I should be concerned about?

This is a common occurrence in Audis and is caused by the engine's high-pressure fuel pump. The slight rattle noise is due to the pump's internal workings and will go away once the engine is warm. It is nothing to worry about.