Hi Had the very same problems last weekend with my 06 plate 2.0 Diesel 5 Series M Sport. Very scary had the car revving out of control with masses of smoke. The fire brigade and police attended. BMW have told be its a new engine, turbo & cat plus other bits £12k in total. They have offered me £5k good will. I really need to find out if this is a common problem and I can then pursue them via a solicitor. I know one person locally to me had the very same two years ago & BMW paid for the engine change.