The BMW 328d xDrive Speed Sensor provides immediate information about the speed of the individual wheels, the basis for pinpoint handling, crisp braking and reliable traction control. Mounted at each hub, the Speed Sensor reads rotation hundreds of times a second and sends crisp signals to computers on board so that BMW throttle mapping, gear changes and stability programs always match actual tire grip. Early 328d xDrive iterations had a passive Speed Sensor using a humble magnet and tone ring, a robust BMW configuration renowned for durability but constrained at crawl speeds. Later 328d xDrive updates adopted an active Speed Sensor, which added Hall effect electronics to amplify weak pulses and pick up motion even as the gap grows with wear. Both formats have the same reluctor ring, so every 2014 to 2019 model of BMW 328d xDrive will be accepted on any 328d xDrive, regardless of their series (sedan or wagon) and will not require any changes. The active Speed Sensor module's sealed housing shrugs off the effects of heat, ice and brake dust, adding to the wider BMW reputation for components that last through daily commutes and spirited weekend drives. Because the Speed Sensor provides input to ABS and dynamic traction systems, it reduces stopping distance on wet pavement and assists the diesel 328d xDrive drivetrain in cleanly launching to improved efficiency as well as safety. Dashboard warnings pop up as soon as one of the Speed Sensor signals is off, allowing drivers to be informed well before cruise control or speedometer accuracy can be affected. Light weight, high resolution and cross-platform compatibility allow this humble Speed Sensor to punch above its weight, making it a true quiet hero that every BMW 328d xDrive owner can really count on mile after mile.
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