2004 air suspension

My grandfather has a 04 gran marq and a few months back the height leveling sensor broke, and since replaced it. Car had the same symptoms today as it did a few weeks ago, assumed it was that sensor again and after replacing it no luck. I really don't know where to start to diagnose this or what to look for and I am hoping someone else here could lead me in the right direction.


I heard the compressor turn on to bring the car to the correct height, the connections around the compressor look good, and obv the sensor is good. I heard no leaks, and didnt know if there was something else to be looking for. Any suggestions would be appreciated!

Just sent it out for repair. $600 for a new compressor to be installed. Seems ridiculous. I saw the compressor and its an easy fix in case anyone comes across this.