This is a high-quality coolant temperature sensor from FEBI BILSTEIN, part number 104172. It is designed to accurately measure the engine's coolant temperature, providing crucial data to the vehicle's engine control unit (ECU). Accurate temperature readings are vital for several engine functions, including fuel injection timing, idle speed control, and cooling fan operation. A faulty sensor can lead to poor fuel economy, rough idling, engine overheating, or the activation of the check engine light. FEBI BILSTEIN is known for its commitment to quality and reliability. This sensor is manufactured to meet or exceed original equipment specifications, ensuring a proper fit and dependable performance. Replacing a worn or malfunctioning sensor with this FEBI BILSTEIN part can help restore your vehicle's optimal operating conditions and prevent potential engine damage.