[Maestro]

Has anyone heard a buzzing/humming sound coming from the rear of the 355i after the car has been turned off. I've heard the sound a few times it does not show up all the time. you can hear it if you bend over near the rear wheels. It sound like a small motor is running. I was wondering if it was the gas pump, which I am assuming it is in the gas tank.

It is not very loud, and I hear most often in my gargage with minimal background noise. I know it is not the turbo spinning down, I know what that sounds like, this sounds more electric. After a few minutes it stops.