Alright.
This I'm sure has been covered somewhere. I bought a 98 XK8. It had 2 Keyfobs. Only ONE worked. I asked how to program. I received the instructions and thank you.
Went to program #2 remote and only the light and trunk worked. Then I go to use keyfob #1, it did not work at all. Strange....
I programmed #1 keyfob then #2 didn't work.
So, after trial and error, I programmed BOTH at the same time. Wallah, they both worked excluding the lock/unlock buttons on #2. Then I took apart #2 and cleaned behind the rubber and circuit board.
All is good and everyone is happy.