I would like to facelift my prefacelift octavia and found couple topics about it, but can’t find anywhere if the preFL xenon to FL led conversion can be done and what coding must be done for the headlights

A pre-FL with xenon's uses module 55 to control the headlights:

- https://forums.ross-tech.com/index.php?threads/8744/

- https://forums.ross-tech.com/index.php?threads/5516/

- https://forums.ross-tech.com/index.php?threads/4753/

 

A FL with LEDs uses module 4B to control the headlights:

- https://forums.ross-tech.com/index.php?threads/15781/

- https://forums.ross-tech.com/index.php?threads/39021/

- https://forums.ross-tech.com/index.php?threads/29381/

 

Therefore, you will need to replace control modules and adjust the wiring to match a FL wiring diagram to get the LED headlights to function correctly.