I got the dreaded "Malfunction Warning, Reduced Power" message on the X5 this past Saturday. First thing that came to my mind was... "oh sh1t, hope it's not the fuel pump!"
The warning went away and stayed away after I turned off the engine for 30 mins.
Went to the dealer this morning to have the code read and they said that the valvetronic servomotor got stuck. They tested it out and it was still within spec so nothing was replaced except for a reprogram. Glad it wasn't a HPFP issue for the N55
