My truck is saying air suspension inactive & now truck is lowering in the front .

Sorry computer controlled and it needs the dealer software to find the fault ,lot of money i would imagine to repair in the dealers

Hi,
Probably the ride height sensor has failed or come unplugged, Crawl under the right side and check it is still connected, if so undo the arm connecting it to the lower suspension arm. Now get someone to start the car whilst you manually move the sensor arm up and down. If nothing happens to the ride height the sensor is gone,or the wiring is damaged or something, and will need to be replaced

Call tire and muffler shop (or any shop that replaces suspensions work) it's probably a reset somewhere.

try disconnecting the battery and then join the battery cables together and leave overnight and see if clears the fault

the system should raise the truck within a few minutes, if it doesn't u most likely have leaking air suspension bag(s)

good chance broken line going to that cylinder. it is still pushing air but just not making it all the way there look at the bleeder valve or the fill valve get spray bottle with soapy water spray suspension in the area of the valve look for bubbles.

I wouldnt change it over to coil spring, not that model. You may not be happy with the results. check out my rover website, www.rockboundrovers.com

check owner manualis ha a swich i can remember togod but some of them work by it self when you put the gear working. star the car open the hood close to the front yopu have to hear like a little compresor that means this device is working. you remember someone jack it up the truck and forgot to shut of the swich????

The EAS can have many different faults that will give the same warning. I have had several air susp problems. First try to disconnect the battery, wait several minutes reconnect then drive car making at least on full circle. If lights remain, air pump (under spare tire ) can be checked, also valve under a cover behind right front wheel, other than these areas, the Testbook diagnostic at dealer will determine if any other parts are source of problem. Unfortunately, with the complexity of the system many other parts Height sensors, etc, etc can also cause the error message. Good Luck.

"looking 4 da relay"
there is a solid state relay for the air suspension system , it is next to or near the air suspension pump located at right front of engine compartment ( relay has a 4 wire connector , colors grey/red , light blue/pink , light green/red , and a dark blue/yellow , also behide the right interior kick panel is a fuse area , 3 fuses are involved with this circuit , fuse #111 - a 50 amp fuse , fuse #27 a 5 amp fuse , and fuse #20 a 30 amp fuse , and don't forget the air suspension service on/off switch . if your not 100% happy with my answer , tell me what i can do to help .

free owners manual ?, best i can say is try ebay , here is several available on ebay.

ebay 03 lincoln navagator owners manuals

J5