How to: program Renault Megane year 2005 3-button smart key card using Lonsdor K518ISE key programmer via OBD.
Connect K518 host with vehicle via OBD diagnostic socket
Switch ignition on
Select Immobilizer->Renault->Select from vehicle->Megane->2002-2008 (93YLM)->Smart Key
Turn on emergency light and switch ignition off
Press Start button and press OK to continue
Open driver door
Lonsdor K518 asks to select key position
Insert smart key to be programmed into card slot
Program complete, program next key
Start vehicle with the new smart key
Succeed.