The Bosch Hot Film Air Mass Meter is a mass air flow (MAF) sensor. It measures the amount of air entering the engine so the engine control unit (ECU) can calculate fuel delivery accurately. Bosch pioneered hot film air mass measurement, and these sensors are used as original equipment by many vehicle manufacturers. Replacing a worn or contaminated air flow sensor can restore proper engine performance. Key Features: Hot film sensing element that measures intake air mass directly, so readings stay accurate across changing temperature and pressure Gives the ECU precise data for optimal air-fuel mixture, which supports smooth running, fuel efficiency, and lower emissions Built to OE-level standards for quality, durability, and consistent signal output Helps address symptoms such as rough idle, hesitation, stalling, poor fuel economy, and a check engine light caused by a faulty air mass meter Designed for straightforward replacement in the intake tract Bosch is a leading global supplier of automotive technology and an original equipment manufacturer. Each MAF sensor in this line is engineered to deliver reliable, repeatable airflow measurement. Choose the specific part number that matches your application.