Know this thread is old but I also have this problem too. I took Ford Galaxy 2008 2.0 Diesel to Dagenham Motors Plaistow (A Ford Dealer) and done a diagnostics on the car and they said I need a new EGR Valve. I sed I will give the car a few days after christmas as I need the car to do my school job. I hand the car to Dagenham Motors Ripple Road (plaistow reffered me) and they done another diagnostic and said I need a new Turbo Solenoid Valve and will cost me £392.59 and I sed I will go ahead with it and Its taking them a week now and they still havent fitted the part in even though its in stock. The mechanic says if the new solenoid valve does not fix the problem then I need a new Turbo which costs me £1,400 which is nearly a quarter of my cars value. Hope it helps.