M5 E60 help needed fuel pressure mystery
I've got a BMW m5 E60 2005 model. At 3k rpm with sport button on or off, at high rpm the management light comes on and I get 'engine fault reduced power'.
I know what you're thinking - heard it all before - but mine is more of a mystery.
I've replaced fuel filter with brand new one - didn't solve it.
Replaced fuel pump with 2nd hand one from 2007 low mileage M5 - didn't solve it.
Reset adaptations by main dealer - didn't solve it.
I'm getting fault code 2788 by itself and I've been told that fuel pressure at idle is too high, and fuel pressure at high rpm is too low.
Next step is replacement of the fuel pump control module. I'm guessing at this because it sounds as though the pump is receiving dodgy signals.
Anyone offer any further advice?