Restore proper timing to your engine with this new direct replacement Crankshaft Position Sensor the CPS is a key component to your engine's timing and firing system. The Crank Sensor in most vehicles usually uses a magnet to determine the position of the crankshaft and sends the info to the Electronic Control Module (ECM) letting the computer know the position of the engine. A bad or malfunctioning crank sensor will often cause a service engine light error code and or cause a no start condition or rough running due to inaccurate ignition and fuel timing.** Factory Replacement Part that Meets or Exceeds Original Manufacturer Specifications for the Vehicles Listed.1988-1993 BMW 535i 3.5L Part Note: SNAP-IN TYPE1988 BMW 535is 3.5L 3430CC l6 GAS SOHC Naturally Aspirated Part Note: SNAP-IN TYPE 1987-1992 BMW 735i 3.5L Part Note: CRANK TIMING1988-1992 BMW 735iL 3.5L Part Note: CRANK TIMING