Single axle self leveling suspension error

I cleaned up and lubed the links but I get this error.

SENSOR HINTEN LINKS VERSORGUNGSSPANNUNG SENSOR AKTIVITAET
SENSOR REAR LEFT SUPPLY VOLTAGE SENSOR MOTION

and a voltage of 23.00mV

Do I need to replace the sensor or is it something else?

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2004 X5 4.4i
USA

SOLD
1989 325i Convertible
1999 328i Convertible
2007 X3