A friend of mine has had his CPO S60 for about a year now. For the past 3 days he has noticed his car makes a constant low volume, high pitched whining sound. He hears it when the car is parked, plugged in or not plugged in. I just listened to it. It's coming from the front of the car, clearly audible standing next to the car inside the garage where it is parked, loudest when you get your head underneath the front end. I can't lateralize it. Audible while driving but only at low speeds and playing music drowns it out. If the car was located in a noisy place I probably wouldn't notice it if I was standing next to it. Anyone had this? Note: car got V8.0 a week ago, the sound started over the weekend, so several days after the software update. I think it is unlikely the sound is related to V8.0.