Genuine OEM Volkswagen Air Mass Meter, part number 03P906461. This sensor precisely measures the volume and density of air entering the engine's intake system. It provides critical data to the engine control unit for calculating the correct fuel injection and ignition timing. Weighing approximately 0.233 kg, this component is typically located in the intake tract after the air filter. Choosing a genuine OEM air mass meter ensures accurate readings and proper engine operation, preventing issues like poor fuel economy or reduced power.