This TOPRAN coolant temperature sensor, part number 111 396, is designed to precisely measure the engine's coolant temperature. Accurate temperature readings are crucial for the engine control unit (ECU) to manage fuel injection, ignition timing, and cooling fan operation, thereby ensuring optimal engine performance, fuel economy, and emissions control. Crafted with quality materials, this sensor provides reliable and consistent performance. It is engineered to meet or exceed original equipment specifications, ensuring a direct fit and straightforward installation. Replacing a faulty coolant temperature sensor can resolve issues such as poor starting, rough idling, overheating, or incorrect gauge readings.