25 418 12-S Throttle Position Sensor Kohler – Genuine OEM Replacement Part25 418 12 S Throttle Position Sensor Kohler Genuine OEM Replacement Part The Kohler 25 418 12 S Throttle Position Sensor (TPS) is a genuine OEM replacement electronic component designed for select Kohler electronically controlled and EFI equipped small engines. This sensor monitors throttle valve position and sends critical input to the engine control module (ECM) to ensure proper fuel delivery, ignition timing, and smooth throttle response. Throttle