The BMW X5 Speed Sensor allows the SUV's computers to know exactly how fast the drivetrain and wheels are turning so shifting, traction and braking occur at the right moment. Located on the transmission output shaft is the Speed Sensor that converts rotation to an electric signal applied by the powertrain or transmission control module to determine the timing for driving a gear change, adjust line pressure and determine when to lock the torque converter. Each wheel itself also carries its own Speed Sensor, which feeds the ABS unit data so that it prevents skids by modulating brake pressure. Early X5 models were based on passive magnetic Speed Sensor units that produce a sinusoidal wave as teeth on a tone ring pass by the pickup; however, later BMW upgrades applied active hall or magnetoresistive designs that incorporate on-board electronics, producing a much better signal at low speeds and tolerating wider air gaps. In successive generations of BMW X5, software was integrated that cross-checks the readings from every wheel, increasing stability and precision in cruise control. These refinements mean that each Speed Sensor now delivers the responsiveness drivers expect from a modern BMW X5.
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