Genuine OEM Volkswagen Nox Sensor, part number 04L907807GJ. This sensor is designed to measure the levels of nitrogen oxides (NOx) in the exhaust gas. It plays a critical role in the emissions control system, providing data for the engine control unit to optimize combustion and reduce harmful emissions. Precisely calibrated for accurate readings and optimal emissions control. Genuine OEM ensures correct calibration, signal integrity, and long-term performance.