Genuine OEM Volkswagen NOx Sensor, part number 04L907807ET. This sensor is critical for detecting nitrogen oxide (NOx) levels in the exhaust gases, providing essential data for the vehicle's emissions control system. It is typically installed in the exhaust system, often downstream of the catalytic converter. Weighing approximately 0.296 kg, this sensor ensures precise readings. Genuine OEM NOx sensors provide accurate calibration and signal characteristics, which are vital for maintaining emissions compliance and the proper function of the selective catalytic reduction (SCR) system.