* Brake pads: If your brake pads are worn out, they can make a whistling noise when they rub against the rotors.
* Brake rotors: If your brake rotors are warped or damaged, they can also make a whistling noise.
* Wheel bearings: If your wheel bearings are worn out, they can also make a whistling noise.
* Power steering pump: If your power steering pump is low on fluid, it can make a whistling noise when you turn the steering wheel.
If you are not sure what is causing the whistling noise, it is best to have your car inspected by a mechanic.
