The Bosch Hot-Film Air Mass Sensor (MAF), also called a mass air flow sensor or air flow meter, measures the amount of air entering the engine so the engine control unit can calculate the correct fuel delivery. Accurate air mass readings help support smooth idle, responsive throttle, good fuel economy and low emissions. Key Features: Hot-film sensing technology measures intake air mass directly, so it is not affected by air temperature or pressure changes Sends a precise signal to the engine control unit for accurate air-fuel mixture control Designed to meet original equipment specifications for fit and function Built with durable housing and electronics suited to the heat and vibration of the engine bay Backed by Bosch's long experience as an original equipment supplier of engine management components A failing mass air flow sensor can cause rough idle, hesitation, poor fuel economy, stalling or a check engine light. Replacing it with a Bosch sensor helps restore proper engine management and drivability. Choose the correct part number for your application from the available options.