Do I need to replace my left rear sensor?
 

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?

Looks like the sensor to me

Replaced the left rear sensor. Fixed the issue.

awesome, thanks for your solution to the posed problem