Most likely you have a leaking spring. Spray soapy water around the air springs and the tubing and check for bubbles.
Best solution is to replace both springs, and if one of your old ones are okay, keep that as a spare.
It is important to fix this problem ASAP, as you will burn out the compressor pretty quickly otherwise.
A new set of springs should be good for another ten years.
Note that the problem could be with the height sensor, but this is less likely.
2002 D2 4.6L V8 Auto SLS+2" ACE CDL Truetrac(F) Nanocom(V8 only)
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