In your air box at the filter side
you will almost always have to replace them.
On a 2003 Ford Expedition : The Mass Air Flow Sensor is between the engine air filter and the big engine air intake tube . If it's the same as on my Ford Explorer it is INSIDE a circular shaped plastic housing ( you can see where the wires enter the housing )
where is the mass air flow sensor located in the 2003 Honda civic
Air intake hose between tb and air cleaner
On a 2003 Lincoln Navigator : The Mass Air Flow Sensor is located between the engine air filter and the big engine air intake tube . It is INSIDE a plastic housing , you will see where the wires go in at the bottom of the housing
On a 1999 Ford Expedition : The Mass Air Flow sensor is between the engine air filter and the large diameter engine air intake tube ( it is INSIDE a round shaped plastic housing )
It does not have a mass air flow sensor.
On a 1997 Ford Expedition : The Mass Air Flow sensor is between the engine air filter and the big engine air intake tube ( it is INSIDE the round plastic housing but you will see where the wires go in )
It does not use a MAF. It has a MAP sensor (manifold absolute pressure) on the front of the intake manifold.
On a 2003 Ford Explorer , 4.0 liter , SOHC , V6 engine : The Mass Air Flow sensor is located between the upper section of the engine air filter housing and the large diameter engine air intake tube
It is part of the Mass Air Flow Sensor. Located at the Air Filter Box end of the Air Intake yube.
On a 1999 Ford Expedition : The Mass Air Flow Sensor is located INSIDE the round shaped plastic housing , between the engine air filter housing and the engine air intake tube