my 07 plate 19d multijet doblo with 20000 mls has had the engine management light on for two weeks,at first it lost power just now and again but today it realy lost it,i couldnt get up the slghtest hill and struggled along at 30mp on the flat,when i revved it up black smoke poured out plus some oil,its now in a garage mechanic mentioned it could be erg valve/turbo/diesel particular filter ,he said the filter costs £1100.00 is this right?find out tomorrow what the story is looking forward to that