This magnetic sensor is mounted on the starter motor and signals the engine control unit when the starter drive is engaged. It is a key component in the starting system, providing the feedback needed to coordinate the starter pinion with the flywheel ring gear. A failing sensor can cause intermittent cranking, failure to start, or starter motor damage from gear clash. As an original AGCO part, the sensor housing and connector geometry match the starter housing bore and wiring harness interface, ensuring the signal is sent at the correct mechanical timing. No modification to the harness or mounting bracket is required for installation.