Measures the mass of air entering the engine, usually with a heated element whose cooling rate indicates flow. That element is easily fouled — oil carried over from an over-oiled aftermarket air filter is a classic cause, and it dulls the sensor's response rather than killing it outright.
Also known as: maf, maf sensor, air mass meter, air flow meter, mass airflow sensor, hot wire sensor, afm
Referenced by 52 codes
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MAF cleaning has a real success story and an inflated reputation, and telling them apart saves both money and misdiagnosis. When it genuinely works: the sensing element has a film...
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