This temperature sensor monitors the coolant temperature in the engine's cooling circuit and sends a signal to the engine control unit. The ECU uses this data to adjust fuel delivery, injection timing, and the engagement of the engine cooling fan. A failing sensor can cause incorrect temperature readings, leading to poor cold-start behavior, reduced power, or the cooling fan running continuously. The sensor is designed to match the original component's thread profile and electrical connector, ensuring a proper seal and a stable signal to the ECU.