Why is my Audi A6 making a knocking noise in the engine?

I recently noticed that my Audi A6 has been making a knocking noise when I start the engine. This noise seems to go away once the car has been running for a few minutes. What could be causing this and should I be concerned?

Hi Haley, it's not uncommon for Audis to make a knocking noise at start-up as the engine warms up. It could be a sign of a loose belt or a worn out pulley. I would recommend taking your car to a certified Audi mechanic to get it checked out.