Just bought a week ago 2000 e55 It was problem with motor some time it lose the power, so I go to the shop and change: MAF, spark plug, fuel filter and oil change, after all this I start testing the car hard. The problem with motor gone but transmission starts shifting on high rpm (2500-3000) on regular driving, I try to shift manually its works. I contact my friend hi has MB computer we connect it and there was no fault code the motor and tranny works good. Is any one here some thing about this problem? Also car has 150k miles.