On my S62, CPS sensors were a bane of our existence. heat and age would cause cracks/delam in the sensor causing 'sloppy' signals, leading to vanos errors. We would prophylactically change all 4 (2 intake, 2 exhaust)



Also, on that motor, the vanos solenoids were FIVE VOLTS, not 12. Did you confirm the voltage used on yours?