Why does my Audi A3 engine make a squealing noise?

I recently noticed that my Audi A3's engine has started making a high-pitched squealing noise. It seems to happen when I accelerate or turn on the A/C. What could be causing this and how can I fix it?

Hi Alexandra, the squealing noise could be caused by a few different things. It could be due to a loose or worn serpentine belt, which is responsible for powering multiple systems in your engine. Another possible cause could be a faulty tensioner or pulley. I recommend taking your car to a trusted mechanic for a thorough inspection to pinpoint the exact cause. It's important to address this issue as soon as possible to prevent further damage.