If they wiring is fine and everything else is fitted appropriately, + OEM ballast, then you will need coding to shut off the checking of bulb.
It usually happens if you fit aftermarket ballasts.
RETROFITS: LCI Conversion - LCI Xenons - LCI Tail lights - Memory heated seats
- Folding mirrors with auto-dip - CIC DAB Plus - Combox - 6FL - 6NF - 6NR - BMW
live & Internet MODS: Eibach Sportsline - AluFelgens CS7 - MS-8 - SWS-8 - Gladen