Valvetronic Servomotor - F22, F3X, F10, X3, X4, X5, X6, Z4

This is the Genuine BMW Valvetronic Actuator (Servomotor) for 2011+ 135i, 228i, M235i, 328i, 335i, 428i, 435i, 528i, 535i, 640i, X3, X4, X5, X6 xDrive35i, M2, M3, and M4 models.

This actuator is what actually moves the Valvetronic system on N20 4-cylinder, N55 6-cylinder, and S55 6-cylinder engines. The actuator uses an internal sensor to determine piston, crankshaft, and camshaft positions and then moves the camshafts and valves based on instructions from the engine computer. It's a hugely important piece of engine operation. A failure of the internal sensor or the motor itself will throw a check engine light and may even stop engine function altogether. There should be a fault code for Valvetronic operation. Other symptoms include a loud, rapid clicking from the valve cover, and hunting idle and throttle hesitations.

This is a Genuine BMW Valvetronic actuator with a two year warranty. Buying a Genuine part will usually be more expensive than an OEM or aftermarket brand but you are assured that it meets BMW's designs for fitment, performance, and longevity. It will also be the very latest design, incorporating any updates or revisions that an aftermarket brand typically will ignore.