I have a 2005 g35x & was wondering if I can program this key fob to my car

 

In 2005 and 2006 the iKey (in your picture) was an option. Does your car have an unlock request button on its door handle and trunk and a "push+turn" ignition? If not, you can not use the iKey but need the more standard remote lock / unlock fob.

If your car DOES have the external request buttons and "push+turn" ignition switch, then you have the iKey option. But be aware you must get a 2005 specific iKey and they generally cost $100+.

Fob above also does not have a mechanical key inside it...

 

You cannot program that fob by yourself, it requires the dealership Consult-II tool, or some independent locksmiths with the correct tool to program the BCM.

 

Moderator edit: Locksmith bot...

 

Good job cleric, you summoned another locksm!th bot.

 

And it took that bot 4 months to find this thread. Strong work.

 

What have I done...

/facepalm