Why does my Audi A4's engine produce an unusual sound?

I've noticed that my Audi A4's engine makes a high-pitched whirring noise when I accelerate, but it goes away when I release the gas pedal. What could be causing this unusual sound and should I have it checked out?

The most common cause of a high-pitched whirring noise in an Audi A4's engine is a failing or worn out serpentine belt. This belt connects and powers various components in your engine, and if it becomes worn or damaged, it can produce a loud and distinct noise. It is recommended to have your serpentine belt inspected and replaced if necessary by a certified mechanic.

Another potential cause of an unusual engine sound in your Audi A4 may be a faulty or worn out alternator. The alternator is responsible for providing power to your car's electrical systems, and if it is not functioning properly, it can cause your engine to make strange noises. It is best to have your alternator checked and replaced if needed by a qualified mechanic.

It is also possible that the noise is due to a loose or damaged engine fan. The engine fan helps to cool down the engine, and if it is loose or damaged, it can create a loud and unusual sound when in use. Have a mechanic inspect and repair the fan as needed to prevent any further issues or potential engine damage.