The Volkswagen Golf Mass Air Flow Sensor is the sensor which monitors the outside air in order that the engine computer can then properly mix the fuel and maintain power and emissions low. This component maintains injector pulse width by always reporting air mass to the PCM, providing the right air fuel mix whether idling in a congested traffic jam or accelerating onto the highway. Previous Volkswagen vehicles were based on a vane air flow meter, which is a spring-loaded flap that pivots with the airflow and transmits its flap position to a potentiometer but has the disadvantage of limiting airflow into the engine, causing mechanical wear and has been known to have sticking issues when the air filter gets dirty. Later Volkswagen vehicles have followed the style of the Mass Air Flow Sensor applied on hot wires, in which a fine electrically heated wire cools as air flows through, and the current requirement to keep temperature constant is a direct indication of air density, and thus provides faster response and a lower impedance to intake. Others became hot film or vortex-based units but all types have the same goal of ensuring that combustion is balanced by adjusting to the alterations in altitude, temperature and pressure. In case of contamination of the Mass Air Flow Sensor or when unmetered air escapes through a hose crack or leaks past the hose, the engine can stumble, stall, or activate the check engine light due to a mixture that is too rich or too lean. Regular cleaning and airtight plumbing also enable all Volkswagen engines within the Golf family to come with smooth starts, high throttle feel, and reliable efficiency.
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