Genuine OEM Volvo Air Charge Temperature Sensor, part number 1389556. This sensor accurately measures the temperature of the air charge entering the engine's intake system. This data is crucial for the engine control unit (ECU) to optimize fuel injection and ignition timing, ensuring efficient performance and emissions control. The sensor features a durable housing and a precise sensing element. Genuine OEM sensors provide the exact calibration and signal characteristics required for optimal engine management.