The BMW X3 M Speed Sensor is a device that constantly monitors the velocity of the wheel and the speed of the vehicle, thereby enabling the dynamic xDrive SUV to adjust its power and braking within a fraction of a second. Applied throughout the BMW range, the robust compact Speed Sensor is engineered for long service life and is able to handle heat, moisture, and winter grime. All X3 M's from the launch year to the recent Competition use the same core Speed Sensor architecture, so whether the crossover is stock or fitted with kits, it will be able to use it. Through the conversion of rotation into clear electrical pulses, the Speed Sensor sends information to the engine control unit, brain of the transmission, and ABS module, ensuring the powerful X3 M uses all six cylinders with little waste and maximum grip. By refining the signal at low speed, the BMW stability system's active circuitry can identify the start of a slide while the driver still feels in control. That calm assurance is largely responsible for the BMW reputation for reliability. By virtue of its greater resolution than the older magnetic rings, the Speed Sensor enables crisper throttle response on mountain switchbacks and smoother day-to-day commutes through traffic lights. Similar precision to that found within the BMW heritage characterizes every Speed Sensor pulse within the X3 M Competition that is track ready and the family of daily-driven X3 Ms alike. The wheel mounted Speed Sensor reacts more quickly than the central road speed pickup, so traction corrections arrive sooner, reducing tire wear and improving fuel economy without taking away the fun that characterizes the X3 M. Every one of the BMW certified Speed Sensors is tested exhaustively. Furthermore, the unit works seamlessly with rain brake support and hill start assist, so safety aids trigger naturally rather than feeling abrupt. There's hardly a component with so much importance in performance peace of mind; this is why many discerning BMW drivers sing the praises of this agile guardian.
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