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Automotive glossary: What is a Mass Airflow Meter or Mass Flow Sensor? (Abbr.: MAF)

Definition of Mass Airflow Meter: To provide a constant, optimal mixture for the combustion in the engine, the amount of incoming air is being gauged. So the amount of fed fuel can be adapted. The mass air flow meter (actually mass air flow sensor) is located in the suction pipe behind the air filter. In diesel or gasoline engines with catalytic converter, a MAF Sensor is mandatory. If the MAF Sensor fails, the engine automatically falls back into a emergency program, to avoid consequential damages. The driver then is being warned by the engine warn light and the engines performance is throttled. Defects often occur particularly when frequently going fast through heavy rain, as spray water may enter the suction area.

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