Hi friends its always assuring knowing I can share my problems with others on this site. My vito 112cdi makes a loud bang of a noise sometimes when on the highway and am accelerating and approaching 120km/hr. This one time bang dissapears there after till I slow down and start gaining speed again. I seem to think its from under the vehicle but I am not sure since the vehicle is moving at quite a high speed. Before and after the bang everything seems alright. Please someone help me!