HTG Car Mass Air Flow Meter Sensor Airflow Intake AFM OEM Replacement 0280217124 for BMW 316i 318i Ci E46 1.6 1.9 Detect the air intake flow of engine. Convert the information to electronical signals & transmit to ECU. Help detect the health/performance of your car. Part Number: 0280217124 (please check before ordering) Direct fit, OEM replacement.