The Bosch 0280218396 Mass Air Flow Sensor is an Original Equipment (OE) quality hot-film air mass meter designed to precisely measure the amount of air entering your engine. This critical sensor ensures optimal fuel injection, improved engine performance, lower emissions, and better fuel economy. Key Features: Hot-film sensor technology with heated membrane for accurate air mass measurement Integrated electronic module calculates air mass from temperature differentials Digital signal filtering ensures accuracy throughout the sensor's service life Direct replacement OE component from a global leader in MAF technology Helps reduce harmful emissions while maintaining fuel efficiency Bosch is a trusted original equipment manufacturer supplying MAF sensors to major automakers worldwide. This genuine Bosch sensor delivers the precision and reliability needed for proper engine management and smooth drivability. When a mass air flow sensor fails, symptoms may include rough idle, increased fuel consumption, poor acceleration, and elevated emissions.