Genuine OEM Volkswagen Ambient Light Sun Sensor, part number 3C0907539B. This sensor is designed to accurately detect ambient light conditions, providing critical input for automatic headlight activation, dashboard illumination, and climate control systems. Weighing 0.022 kg and measuring 0.056m x 0.033m x 0.03m, it is a compact and essential component. Choosing a genuine OEM sensor ensures precise calibration and signal characteristics, which are vital for the proper functioning of interconnected vehicle systems.