Genuine OEM Audi Mass Air Flow Sensor, part number 077133471J. This sensor is crucial for engine management, accurately measuring the mass of air entering the engine to ensure the correct fuel-air mixture. It is typically located in the intake system between the air filter and the throttle body. Constructed from durable plastic, this sensor weighs approximately 0.388 kg. Opting for a genuine OEM sensor ensures precise calibration and reliable signal characteristics, critical for maintaining engine efficiency and emissions compliance.