Engine Knock Sensor - 2011 528i E70

The BMW N52 inline-six relies on dual knock sensors mounted on the engine block's intake side to detect detonation. For the 2011 F10 528i, the critical OEM reference is 13627525014, though 13627568421 frequently appears as a service replacement. These piezo-electric sensors thread into the block beneath the intake manifold, monitoring cylinders 1-3 and 4-6 separately. Interchange spans 2006-2013 E9x 3-Series (328i), 2010-2012 F10 528i, and E70 X5 3.0si models sharing the N52B30. When junkyard hunting, verify the Bosch casting numbers rather than relying solely on BMW labels, as supplier markings survive longer than adhesive tags. Installation demands strict adherence to the 20 Nm torque specification—over-tightening destroys the internal crystal. Always inspect the connector for oil contamination, a telltale sign of N52 valve cover gasket leakage that destroys sensor circuits. Clean the mounting pad with brake cleaner and apply dielectric grease to the pins. If retrieving from a donor, prefer sensors from low-mileage engines or those with intact mounting ears, as heat cycling commonly cracks the plastic mounting tabs.