Why does my Audi A4 make a rattling noise when I start the engine?

I've noticed that my Audi A4 makes a rattling noise whenever I start the engine. It only lasts for a few seconds and then goes away. Is this something that I should be worried about and should I take it in for repairs?

This rattling noise is most likely caused by a loose or worn-out component in your engine. It's always better to err on the side of caution and have it checked out by a certified mechanic to avoid potential further damage.

As an Audi mechanic for the past 10 years, I can tell you that this is a common occurrence in the A4 model. It's usually caused by a faulty oil pump or a worn timing chain. I recommend taking it to a trusted mechanic for a proper diagnosis.

I had the same issue with my Audi A4 and after doing some research online, I found out that it could be due to a faulty vacuum pump. It's a relatively inexpensive fix, but still worth getting checked out by a professional.