Number one reason the rear sags in a air suspension expedition is because of a 5 dollar or so relay. Their is a TSB addressing this issue with the relay being the fix
Number 2 reason is the compressor is bad.
I bought two compressors before the dealer told me I had a bunch of holes in the air lines. I took my money elsewhere and found Strutmaters.com. I saved time and had a no air kit sent to my mechanic. I saved money too, my kit was half what I would have to pay to fix the air ride. My car is fixed and has been riding great again! Tks to Strutmasters.
Air compressor under hood may be bad, or the air bag module for the air bags. Very expensive to repair. $900-$1200
SOURCE: air suspension went out
All things are possible, it's more how much, not can I these days.
I would contact one or more of the big name auto parts stores and see what shocks and or kits they have to offer.
This way you can decide what solution suits your needs and your budget.
Hope this is of some help.
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