Why does my Audi A6 make a high pitched noise when I start it?

Whenever I start my Audi A6, there is a loud, high pitched noise coming from the engine. It goes away after a few seconds, but it's concerning. What could be causing this?

The high pitched noise could be a sign of a worn out or loose serpentine belt. It's important to get this checked and replaced if necessary, as a malfunctioning belt can cause damage to other components in your engine.

I once had a similar issue with my Audi A6 and it turned out to be a faulty starter motor. A quick replacement solved the problem and my car runs smoothly now.