Genuine OEM Volkswagen Lambda Probe, part number 03E906262B. This oxygen sensor measures the amount of unburned oxygen in the exhaust gas. It is typically located in the exhaust system before the catalytic converter. Accurate readings from this sensor are crucial for the engine control unit to adjust the fuel-air mixture, ensuring optimal engine performance and emissions control. Genuine OEM parts are manufactured to exact specifications for precise calibration and long-lasting service.