Genuine OEM Volkswagen Nox Sensor, part number 05N907807D. This sensor is crucial for monitoring and regulating nitrogen oxide (NOx) emissions from the engine's exhaust system. It is typically installed in the exhaust stream before or after emission control components. The sensor's accurate readings help the engine control unit optimize fuel combustion and manage after-treatment systems. Genuine OEM parts are manufactured to exact specifications, ensuring precise calibration and reliable performance for emissions compliance and optimal engine function.