Genuine OEM Audi Air Quality Moisture Sensor, part number 4H0907658. This critical sensor is responsible for accurately detecting both air quality and moisture levels within the vehicle's environment, often integrated with the HVAC system to optimize cabin air. It helps manage air recirculation and dehumidification, enhancing passenger comfort and preventing window fogging. Constructed from durable PA66 GB30 plastic, it measures 0.05m in length, 0.048m in width, and 0.028m in height, weighing 0.0275 kg. Opting for a genuine OEM sensor ensures precise calibration and reliable signal characteristics, which are essential for the accurate functioning of the climate control system.