Genuine OEM Volkswagen NOx Sensor, part number 04L907807GK. This sensor is a critical component of the vehicle's emissions control system, specifically designed to measure the concentration of nitrogen oxides (NOx) in the exhaust gases. It plays a vital role in optimizing engine performance and reducing harmful emissions. Located in the exhaust system, this sensor provides crucial data to the engine control unit. Genuine OEM NOx sensors are calibrated for precise measurements, ensuring your vehicle meets emissions standards and operates efficiently.