Genuine OEM Volkswagen Nox Sensor, part number 059907807AF. This sensor is installed in the exhaust system to measure the concentration of nitrogen oxides (NOx) and transmit this data to the engine control unit (ECU). Accurate NOx readings are essential for optimizing the exhaust after-treatment system and meeting emissions standards. This unit weighs 0.45 kg. Genuine OEM sensors are calibrated to exact specifications, ensuring precise measurements critical for emissions control and engine performance.