After driving for aprox 1/2 hour I get my air suspension lite .. A friend pulled a code C1818 .. LR system timed out .. Does that mean the compressor timed out before it reached the proper ride height signal ? .. The suspension seems to be operating properly .. Meaning it doesn't leak down .. But corrective action is to adjust height sensor . .. The car sits at 27" wheel lip to ground and doesn't appear to be riding high or stiff ..How is the height sensor adjusted ? And what is the proper height for the 02 Towncar ?