Genuine OEM Audi Sun Sensor, part number 4L0907539B4PK. This critical sensor is responsible for detecting the intensity and angle of sunlight, providing essential data to the automatic climate control system to adjust cabin temperature and fan speed, or to the lighting system. It is typically positioned on the front dashboard. The sensor is compact, measuring approximately 5.3 cm in length, and comes in a 4PK black finish. Choosing a genuine OEM sensor guarantees precise calibration, reliable signal characteristics, and seamless integration with the vehicle's complex electronic systems for optimal performance.