Air suspetion inactive ,trainsmition in neutral both codes

The most common issue is that you need to replace the air springs, they are leaking, very common on older Navigators.

Ford Air Ride Rear Suspension Down Diagnosis & Fix ...

? 9:57
https://www.youtube.com/watch?v=wfh7n17hvN8
Feb 24, 2014 - Uploaded by FordTechMakuloco
Ford Air Ride Rear Suspension Down Diagnosis & Fix ... why theair ride compressor is not turning on and pumping up the air ridesuspension on your truck. ... Ford Expedition & Lincoln Navigator Air Ride C1725 Common Faults ... 2000 Ford Expedition - Replacing the rear shocks with load leveling shocks ...

2003 Lincoln Navigator air suspension fix(3) - YouTube

? 3:41
https://www.youtube.com/watch?v=MhWlcYycny4

Try this from my previous post....

Have a similar problem... My 2003 Lincoln Navigator was manufactured May 22, 2003 so it's the late model that came with the Intec 5.4 Liter DOHC V-8 (not the Triton engine).

I replaced the two front ride height sensors (one for each air strut) and replaced the one rear ride height sensor that controls the ride height for BOTH rear air struts. (Yours may have one ride height sensor for each of the rear air struts.) That solved the problem for a few months during the warm months, until the weather started cooling off. Then back to the same issue.

The front passenger air strut started releasing air from the solenoid (air block) making a "hissing sound." Replaced BOTH front air strut solenoids (connected at the top of each air strut). That also resolved the problem for a few days. After going all around the world, I discovered it's the Air Ride Control Module (ASM) that was the problem all along.

your shocks are leaking or a leak in the lines or pump it has a rolling diaphram when you hit a speed they lower and raise on speed

if you cant find the leak you can pump the strut with a compressor if it has a leak replace it if they are expensive and you wish a cheeper fix you can cap off the front lines or rear or replace all of them with regular coils and struts if off a used car the struts may be bad the spring is heavy and the strut needs to be removed and checked if its bad get new ones they are not cheep but the air ride struts new are a grand or better well they use to be a used one was a few hundred i replaced them with springs on a gl-10 years ago and the light may blink remove the bulb or a wire under the drivers side seat not sure on that year

SOunds like a broken shock, or bad strut. Air bags or not, struts and shocks are what control bounce.

You can check it for a leak by getting into vehicle and close the door.Turn ignition switch to on position and shift the gear shifter to neutral.You will hear the compressor turn on.Once compressor turns on put back into park,leave ignition on and exit vehicle.Compressor will turn off when you open door but will turn back on after you close it. Now listen at each corner to see if you can hear where your leak is.

Air Suspension Inactive usually means there is a problem with the Air Suspension. However, it will also come up when alternator or battery voltage is low, or when you reset (disconnect and then connect) the battery. To reset it manually: while in P(ark), turn steering wheel all the way left, hold few seconds, and then all the way right, hold few seconds. All the warning lights will go out. Most common failure is the passenger front air strut, since batteries are prone to leaking acid, it leaks right on top of the rubber airbag and burns through it. Dealer willcharge you one hour to diagnose, or you can easily diagnose this by looking at the ride height of each particular corner of the truck. If its sits low, or emits hissing sound when you park the truck, its leaking. If you keep driving with leaky air strut, you risk burning up the air compressor, as its working extra hard to compensate for the leak. Replacing the strut is easy 45min job even for a novice mechanic, and you can do it yourself. Strut can be found new for approx $750 online. If you are fed up with air suspension issues, there is a $700 kit that converts the truck to springs, and disables all of the air suspension. Look up Arnott Industires

Tough to tell from your description. I would check the strut mount. That is the top assembly that the spring seats against. The top rotates, or should. The night part puzzles me.

There is a problem with the air-ride system, or the active body control system.

Is the car sitting lower than normal?