Genuine OEM Volkswagen Nox Sensor, part number 03N907807AJ. This sensor is part of the exhaust system, monitoring nitrogen oxide levels. It is located in the exhaust stream to measure emissions. The sensor has a weight of 0.259 kg and dimensions of 0.17m x 0.16m x 0.05m. Genuine OEM sensors provide the exact calibration and signal characteristics required for accurate emissions control and engine management.