My bad sign was my car was on the ground one morning. I guess there could be other things too. If your compressor is running all the time and stuff like that. My advice on this is if your having issues with anything on your air system, do away with it! I found a company called Strutmasters that has conversion kits for Expeditions. I put one on my 2001 and love it. I haven't had no more problems with my ride since then. It may be the answer to your problems with your air suspension. It was mine.
Check the Height Sensor.
Speed sensor on a 2001 ford expedition
On a 1997 Ford Expedition : ( NO ) not on the front suspension It could have the REAR load levelling air suspension
NO
where is the speed sensor on my 2000 ford expedition v8 5.4 motor
Where is the camshaft position sensor on a 2005 Expedition?
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Dpme sensor ???
in the center of the dashboard
( 26 gallons ) 4X2 with standard suspension ( 30 gallons ) 4X2 with air suspension ( 30 gallons ) 4X4 On 1997 to 2002 Ford Expedition
On a 2000 Ford Expedition : Rear wheel drive , standard suspension ( 26.0 U.S. gallons ) Rear wheel drive and 4x4 with rear air suspension ( 30.0 )
On a 2001 Ford Expedition : The GAS TANK SIZES in U.S. gallons are : Standard suspension ( 26 ) Rear air suspension and 4x4 ( 30 )