As Anthony mentioned, I have halogen lights and nothing re self leveling on any wheels.

I think I have fixed the problem. Firstly I unplugged both headlights and plugged them back in and this fixed the drop problem as both lights then did their little twitch down and came up, but my little adjuster wheel didn't work. Then I did a scan with PA Soft 1.4 and for some reason there is an option to select automatic for leveling which was ticked. I unticked the box and now the wheel allows me to move headlights up and down.

I don't know what caused the glitch, but hopefully the reprogramming will have solved the problem permanently.

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2004 E53 diesel.
Titan silver on black
Sports package