The Bosch Hot Film Mass Air Flow (MAF) sensor, also called an air mass meter or MAF sensor, measures the amount of air entering the engine. It sends that data to the engine control unit (ECU). The ECU uses it to calculate the right fuel delivery for good performance, fuel economy and emissions control. Key Features: Hot film sensing technology that measures intake air mass directly Fast response to changes in airflow, which supports precise air-fuel ratio control Electronic output signal sent to the engine control unit for real-time fueling adjustments Built for durability under engine-bay heat, vibration and changing conditions Made by Bosch, a leading original equipment supplier to automakers worldwide A worn or contaminated MAF sensor can cause rough idle, hesitation, poor fuel economy, stalling or a check engine light. Replacing it with a quality Bosch sensor helps restore smooth drivability and efficient engine operation. Each part number in this product line is engineered to meet the demands of its specific application.