Motor mount

I have a 2004 Nissan Altima, when I bought this car it was only 68K's. I am up to 78K's right now.
I heard a buzzing sound under the hood, went to the dealer and they told me that the front electric motor mount needed to be replaced. But when the car is running it's fine, there is no noise, the buzzing sound is only when I shut the car off. Does anyone know anything about this? Is it a malfunction or do I really need a front motor mount?
Hoping to hear from somoene soon.
thank you

did you open hood to try to locate buzzin sound?never heard of electric motor mount....:confused:.try to locate noise then let me know..

yes found the sound,called dealer and they said it was the front mount they said there was a sensor built in the front motor mount.

ahhhh trippy...these new cars never cease to amaze....is it like an air pump or something thats connected to the mount?

I think if there is any wear in the mount the sensor picks it up now here this they want $380.00 for the thing and thats not in the car. Man they get you every time well its got to be done. thank you.

i know man,sux.....let me know exactly what happens when you make it right..I want to know what the part is called.,or what it does