This sensor monitors the operating state of the gearbox and provides a signal that the transmission control unit uses to manage power delivery. It is mounted directly on the gearbox housing, where it detects the rotational speed or position of an internal shaft. A failed sensor can cause the transmission to shift erratically, enter a limp-home mode, or fail to engage certain gears. The original AGCO component is calibrated to the same electrical output range as the factory-installed unit, which ensures the control unit receives a signal it can interpret without recalibration. When replacing this sensor, clean the mounting bore and apply the specified thread-locking compound to the fasteners.