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Questions and Answers

Ford Aerostar Mass Air Flow Sensor

Q. Dear Vincent, I have a 1993 Ford Aerostar 4.0 liter V-6. The check engine light comes on and the code reader indicates the Mass Air Flow Sensor (MAF). I got a replacement from the wrecking yard, and the check engine light no longer lights up, however the car does not accelerate much past 25 mph and takes some urging to get up to speed beyond that.

Ford Aerostar Mass Air Flow Sensor

I did not disconnect the battery when I did the replacement. Do I need to do that to let the onboard computer reboot? The MAF sensor part number ends with A2C, can I substitute a sensor ending with A1C? I'd prefer to do this as inexpensively as possible! Thanks for all your help.


A. Specific code numbers are required to allow me to give you the best possibilities. Going through 1,500 some-odd code descriptions is very time consuming and makes errors more likely. Or maybe people like to make me work harder than is necessary?

Before I recommend replacing the Mass Air Flow (MAF) sensor, I always recommend cleaning the MAF. The MAF is prone to getting dirty and one of my other readers came up with an excellent fix for it.

I have covered this question many times before. Here is where you will find the answer.

Ford F150 Codes P0171 & P0174

Ford Expedition P0171 & P0174

Ford Mass Air Flow Sensors

The part number I have listed from Ford is FO7Z12B579AARM. As for interchangeability, I have no cross reference charts to tell me that. You can try disconnecting the battery and see what happens. It will take 10 to 15 miles to let the PCM relearn it's parameters.

Additional Information provided courtesy of AllDATA

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