Bosch 0280217500 Mass Air Flow Sensor

The Bosch 0280217500 is a hot-film type mass air flow (MAF) sensor designed for precise measurement of intake air mass in Mercedes-Benz gasoline engines. It utilizes a thin-film sensor element on a ceramic substrate to provide a frequency or analog voltage signal proportional to air mass flow rate to the engine control unit (ECU). This sensor serves as a direct OE replacement for Mercedes-Benz part number 0000940548. It features a 4-pin electrical connector and a PBT-GF30 reinforced polymer housing resistant to engine bay temperatures and vibration. The unit is calibrated for the M104 engine family (2.8L and 3.2L DOHC inline-six) used across W124, W140, W202, R129, and W463 chassis platforms from 1993 to 1999. Cross-references include 0280217501, MF21069, and various aftermarket SKUs.