just bumping this thread for those who are not yet informed when going lower.
Make sure that your HID rear leveler elbow must be pointing outside (ex < not >). The front leveler elbow should point outside as well.
This is for a 2008 MK5 GTI. I think for the '06s the rear levelers point inside like >.
I then opened VAG-COM [55 - Xenon Range] >> Adaptation >> Group 000 (Default Factory settings) >> Go >> Save >> Done Go Back
[55 - Xenon Range] >> Basic Settings >> Group 001 >> Go >> wait..20 seconds >> (turn HID) >> (it will say Learned) >> Done Go Back.
(- at this point it should start learning the settings you have for the HID)
[55 - Xenon Range] >> Fault code >> Clear Code >> 01539 error code disappeared.
Hope that helps.
I just had my coilover re-adjusted last friday cause of a strut upper mount bearing failure and my mechanic forgot to put back the levelers (yikes), so I had this issue over the weekend and my HID's were pointing down. But today it got fixed. Yay!