Genuine OEM Volkswagen NOx Sensor, part number 05N907807H. This sensor is a critical component of the emissions control system, measuring the concentration of nitrogen oxides (NOx) in the exhaust gases. It is typically installed in the exhaust system. Accurate readings from this sensor allow the engine control unit to optimize combustion and after-treatment processes. Genuine OEM NOx sensors are precisely calibrated to ensure correct engine management and compliance with emissions regulations.