W211 e320 self leveling issue

[Slackmerc]

I just refurbished my compressor as was sounding like a tractor, but now the car won’t come back up to height.

I only have the self levelling suspension not airmatic.
I can hear the compressor working for a few mins at start up but then it stops.

From what I can tell it suggests that the level sensor is faulty?

But If i jack the car up the red error message goes away?? Which suggests to me that the sensor is reading the height correctly??

When I checked codes I had

5152
5501
5505
Cleared them all but 5501 remains after restart and running the car for 30mins

Thanks in advance