Rear right level sensor works for both light aim and suspension setting. The sensor has two separate circuits in the same housing individually for both systems. The wiring for both circuits is also separate. It could be the sensor itself or wiring failed. With diagnostics you can see what height/voltage both circuits are showing. If you really want to test you could change the pin assignment on the sensor so light aim level and suspension level is mixed.

Attached Images

 

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E39 530dA -02 M-Sport Messing metallic
E53 X5 3.0dA -06 Sport Stratus grey
E70 X5 40d -12 M-Sport Space grey