Genuine OEM Volkswagen Lambda Oxygen Exhaust NOx Sensor, part number 03N906261B. This critical sensor is installed in the exhaust system to precisely monitor the levels of oxygen and nitrogen oxides in the exhaust gas. Its readings are vital for the engine control unit to adjust fuel mixture and ensure optimal combustion, emissions compliance, and overall engine efficiency. The sensor assembly includes a probe and an electronic module, weighing 0.218 kg and measuring approximately 0.188m x 0.134m x 0.048m. Choosing a genuine OEM sensor guarantees exact calibration, signal characteristics, and durability, which are essential for accurate emissions monitoring and preventing diagnostic trouble codes.