Hi all
I am very new to the BMW world and have got a problem with our F20 116, it's a 2012 sport and was purchased from a local BMW dealer with just 9800 miles showing.
It's my wife's car so I haven't driven it until recently, under hard acceleration or making the engine pull from about 1500 rpm when it gets to about 2000 rpm the boost cuts out and you can hear the pressure valve dumping, this happens a couple of times then the engine seems to rev normally, it does this every time you put your foot down.
I'm guessing it's turbo related but has anyone else experienced this?

Thanks for any help or advice
Pete