How do you program infiniti fx 35 key fob?

You have to get them programmed at the dealership only.

Or if you don't want to spend the overpriced amount your dealer will rip you off on than try this. Programing a Nissan or Infiniti remote , is hidden secret but I will share it.

Just get in your car , close all doors. Using your power lock switch , lock all doors. After doors are locked take your Ignition Key and insert it and remove it from ignition switch in a slow fashion , but consistent pace. (97 and earlier are fast) When you see the hazard lights flash, put key in ignition switch and turn to the On position .. Do NOT CRANK or you will have to Start over .. After in the On position .. Hit the Lock button on remote... Hazard lights should flash..( note..you have to reprogram all remotes when adding a new one , if you don't your old remotes will not work ) If your doing just the one , turn ignition switch off and unlock door and get out and try it. If you are doing more than one. While still in Car with Key on . After you hit the Lock button on Remote and hazard light flashed .. with key still on .. use master lock switch unlock doors and re-lock and then hit Second Remote, Lights should flash again , repeat if adding a 3rd remote.. after done just turn key off and unlock door and get out and try.

Sorry..there is no way to program you actual key. You need to go to dealer or you can support your local locksmith for a much cheaper price.