This gearbox pressure sensor monitors hydraulic pressure inside the transmission housing and sends a signal to the control unit. It is mounted directly into the gearbox casing, where it reads fluid pressure during clutch engagement and gear shifts. A failing sensor may cause erratic shifting, delayed engagement, or a warning light on the dash. As an original AGCO component, the sensor body and sealing face are machined to match the port geometry of the transmission housing, ensuring the O-ring seats correctly and no pressure bleed occurs at the threads. On removal and reinstallation, replace the sealing O-ring and tighten the sensor to the specified torque.