Why is my Audi's engine making a whistling noise?

I recently noticed that my Audi's engine is making a high pitched whistling noise. It happens mostly when I accelerate. What could be causing this?

The whistling noise in your Audi's engine could be caused by a loose or worn-out serpentine belt. It's important to get this checked and replaced if needed, as it can lead to other engine problems.

Another common cause of whistling noises in Audi engines is a damaged or clogged air filter. Make sure to regularly change your air filter to prevent any potential issues.