Genuine OEM Audi NOx Sensor, part number 05L907807CE. This critical sensor is installed in the exhaust system, where it continuously monitors the levels of nitrogen oxides (NOx) in the exhaust gases. Its readings are vital for the engine control unit to manage emissions and optimize combustion. Weighing 0.221 kg, this sensor provides precise data. Using a genuine OEM NOx sensor ensures accurate readings, proper calibration, and effective operation of the vehicle's emissions control system.