Genuine OEM Audi Front NOx Sensor with Control Module, part number 8K0907807N. This critical sensor monitors nitrogen oxide levels in the exhaust gases, providing data to the engine control unit for emissions management and optimal engine operation. It is typically positioned in the front section of the exhaust system. This assembly includes the sensor and its integrated control module, weighing approximately 0.3 kg. Using a genuine OEM sensor ensures precise calibration, accurate readings, and seamless integration with the vehicle's complex emissions system.