Why is my Audi A1 making a strange high-pitched noise?

I recently purchased a used Audi A1 and have noticed a high-pitched whining noise coming from the engine when I accelerate. What could be causing this and how can it be fixed?

It is possible that you have a faulty vacuum pump or belt tensioner, which can cause a high-pitched whine when they begin to wear out. We recommend taking your car to a certified mechanic to have it inspected and repaired if necessary.

Another potential cause could be a damaged or loose serpentine belt. This belt helps power various components in the engine, so if it is damaged or not tightened properly, it can make strange noises. We suggest having it checked and replaced if needed.