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Air Mass/Flow Sensors Fits:Porsche 996 1998 -2001 C4 M620 (E-Accelerator)Porsche 996 Turbo A mass airflow sensor is used to determine the mass of air entering an electronically fuel-injected engine. The air mass information is necessary for the engine control unit (ECU) to calculate and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature and altitude, and this is an ideal application for a mass sensor
