The Bosch Mass Air Flow Sensor (MAF sensor) uses hot film technology to measure the amount of air entering the engine. It sends an accurate signal to the engine control unit (ECU). The ECU uses that signal to calculate fuel delivery, so the engine gets the right air-fuel mixture for efficient combustion. Bosch is a leading OE supplier, and this air flow meter is built to the same standards. Key Features: Hot film sensing element that measures intake air mass Supports precise fuel metering, smooth idle and steady throttle response Helps maintain fuel economy and keep emissions in check Made with OE-level quality and tested for reliability Designed as a direct replacement for the original sensor Housing and connector are built to hold up under engine bay heat and vibration Why Replace a MAF Sensor: A dirty or failing mass air flow sensor can cause rough idle, hesitation, stalling, poor fuel economy, reduced power or a check engine light. Installing a new Bosch hot film MAF sensor can restore normal engine management and driveability. Choose the specific part number for your application from the options listed on this page.