Such contamination could occur as early as 18,000-25,000 miles, depending on the vehicle model. Dust, dirt and other debris can all get into the sensor and are one of the primary causes of MAF failure. That’s a lot of air! And with that comes the potential for a lot of contamination. In fact, more than 9000 liters of air can flow through the engine for every liter of fuel used. Since the MAF sensor is responsible for measuring air flow into the engine, they have a lot of air passing through them. The quantity of air entering the engine is adjusted accordingly. The current is then changed to a frequency or a voltage that is sent to the ECU and interpreted as air flow.
When the temperature difference between the two sensing wires changes, the MAF sensor automatically increases or decreases the current to the heated wire to compensate.
As air flows across the heated wire, it cools down. One is heated by an electrical current, the other is not. Installed in the intake pipe between the air filter housing and the intake manifold, most MAF sensors work on the hot wire principle.
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