Avoid programming LR proximity keys with Maxisys. Just got a 2010 LR4, customer bought an extra dealer  key. Since adding a key was in my Maxisys menu I tried to program second key, Maxisys erased even the working key, all it did was to program the remote part of it,  did not start after that. Had to tow to the  dealer. I know there are other tools that can program LR keys but couldn't have customer waiting till I got one of those tools.