Genuine OEM Volkswagen Air Mass Meter, part number 2HJ906461. This sensor measures the amount of air entering the engine, providing crucial data for the engine control unit to adjust fuel injection. It is located at position 6 in the diagram. The part has dimensions of 0.085 m x 0.045 m x 0.038 m and weighs 0.046 kg. Genuine OEM air mass meters provide accurate airflow readings essential for optimal engine performance and fuel efficiency.