Got the car serviced recently and the software updated, they changed both front brake flexis as well for a recall issue, since the car is back there seems to be a very low buzzing,vibration from the top of the engine area under the cover at idle. Once the car moves off the sound stops but when slowing down again at lower speeds and engine revs the sound appears. It seems to change with the engine rev as the car slows down.??

Fill in your car profile so as members on here know what model, year and engine.

Like this by chance?

Sorry gregdav,thought I had filled it out . The noise is only there with engine running.

Maybe they have not tightened a cover or something down properly.
It maybe a resonance issue, and will only vibrate at those Rev's, does it do it if you just rev the engine?.
Of course your other alternative is to go back to whoever serviced it..
good luck. Greg.

Main dealer serviced,after giving it a quick check it sounds like its from the fuel pump? No light or symptoms yet?