The mass air flow sensor (MAF) may fail resulting in a rough engine idle, hesitation on acceleration, and/or engine stalling. The Check Engine Light may or may not illuminate. A failed mass air flow sensor will require replacement.Google+
Car Problem Reports
Ford Expedition Check Engine Light Due to Failed MAF Sensor
Ford Expedition Problem
Engines Affected: 4.6L V8, 5.4L V8
Average Mileage: 143,223 mi (95,000 mi - 196,000 mi)
Visitor, 2003 Ford Expedition, 5.4L V8, 144,900 mi
engine sluggish at speeds of 45-55 mph and check engine light on and blinkls constantly.
Visitor, 1997 Ford Expedition, 5.4L V8, 126,000 mi
Rough idle/check engine light/ told to clean with MAF spray - Auto Zone
Visitor, 2003 Ford Expedition, 5.4L V8, 166,000 mi
Check engine (service engine soon)light with rough idle at times. I have been able to get the light to reset by disconnecting negative battery cable to see if it would come back. Took a week for it to show back up the first time. Went to Auto Zone and pulled code. 171 and 174 I think. Do not remember the numbers but the employee said Mass Air Flow Sensor (MAF). $100 for replacement. Had to order. In mean time several videos on you tube. Looks pretty easy and much cheaper than taking it to a shop.
Visitor, 2002 Ford Expedition, 5.4L V8, 196,000 mi
Hesitation on acceleration
Visitor, 1999 Ford Expedition, 4.6L V8, 178,000 mi
Code 171 & 174; rough/high idle; not yet fixed.
Visitor, 2001 Ford Expedition, 4.6L V8
My fan clutch starts to wobble and touch cover over the fan itself.
Visitor, 2000 Ford Expedition, 5.4L V8, 130,000 mi
Not yet fixed. Newest code.