This FEBI BILSTEIN coolant temperature sensor, part number 29643, is designed to provide precise monitoring of your engine's operating temperature. Accurate temperature data is crucial for the engine control unit (ECU) to manage fuel injection, ignition timing, and cooling fan operation, thereby ensuring optimal performance and preventing overheating. Crafted with high-quality materials, this sensor offers reliable and durable service. It is engineered to meet or exceed original equipment specifications, guaranteeing a perfect fit and function. Replacing a faulty coolant temperature sensor can resolve issues such as poor fuel economy, rough idling, and engine warning lights.