The MAF sensor provides air density and temperature data to the engine control unit for calculating the proper air-fuel mixture.
AutoZoner A is correct. The Mass Air Flow (MAF) sensor measures the amount of air entering the engine. It provides data on air density and temperature, which are crucial for the engine control unit to calculate the proper air-fuel mixture. AutoZoner B is not entirely accurate as the MAF sensor helps in determining the correct air-to-fuel ratio by providing air information rather than directly adjusting it.
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