Filling the tank unrelated to filling the air spring. FYI air bag is Wyatt deploys in an accident not what holds up the car.

Scanner like foxwell can command the car to fill the springs even when the sensors aren't working properly.

The arms that connect the sensors to the control arm rust and malfunction so you should pull them off and clean/refurbish them and make sure they are both vertical and straight. (and smoothly operating).

Quite regularly somebody posts on xo where the arm gets turned horizontal puts the sensor arm vertical and will stop working

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)