Genuine OEM Audi Lambda Oxygen Sensor, part number 4H0906262J. This critical sensor is responsible for measuring the oxygen content in the exhaust gas stream. Its readings are vital for the engine control unit to optimize fuel mixture, ensuring efficient combustion and reduced emissions. This sensor is installed within the exhaust system. Weighing 0.3 kg, it is a compact and precise component. Choosing a genuine OEM oxygen sensor ensures accurate signal characteristics and factory calibration, which is essential for proper engine performance and emissions compliance.