This is a DIY guide to installing Retrofit Lab's Bi-Xenon kit for the E39 BMW 5 Series (facelift). The projector lenses in these old BMWs commonly develop internal fog which greatly reduces their light output.
This video applies to OEM Hella halogen headlights for facelift E39 models between 2000 and 2002. Factory xenon headlights have a different installation process - this video is for halogen headlights only. During 2002, Hella began using a different adhesive to seal the headlights which makes them nearly impossible to open like many other modern headlights. Pre-2002 facelift units like mine use butyl sealant and are easy to open by hand.
Please note - once installed, make sure your headlights are aligned correctly. You can do this by parking on a flat surface near a wall to get an accurate idea of what angle the headlights are set to. You can then set them using the same 8mm-hex adjustment dials shown in the video. Measure the height of your headlight lens from the ground and apply a piece of tape on the wall at the same height. The top cutoff of the light pattern should be at or below this mark.
Check out Retrofit Lab's product listings for the facelift E39 here (not sponsored): retrofitlab.com/collections/b...