Rick's Free Auto Repair Advice

P0101

Fix code P0101 Mass or Volume Air Flow Circuit Low Input

The Mass Airflow Sensor (MAF) measures the temperature and volume of air flowing into the engine. The computer uses that information to calculate air density and thus can determine how much fuel to add to the air.

The sensor receives a reference voltage from the computer and ground. Depending on the type of MAF sensor, it can alter the returning voltage or generate a digital square wave back to the computer.

A P0101 code means the computer has detected a value returning from the MAF that is outside the allowable range or of low value. The computer determines that it is a low value by comparing the reading to inputs from other sensors.

© 2012 Rick Muscoplat

Posted on by Rick Muscoplat


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