I've just had the same problem, not sure I've got all the answers though. Bought my 2002 X-Trail with only 1 key. The Nissan dealers want a small fortune for a second key.
Basically if I understand correctly (feel free to correct me if I'm wrong here!) there are three components to the keys, each of which must be copied:
1. They physical key needs to be cut so you can open doors, insert into ignition etc (can be done cheaply at most key-cutting places).
2. The transponder chip in the key needs to be coded so that when you insert the key in the ignition, the immobiliser will let it start the engine. This can only be done by Nissan dealers or (I believe) some more advanced key-cutting places/locksmiths with the right equipment.
3. The remote central locking/alarm "Blip" part of the keyfob needs to be programmed to your vehicle. This can be done yourself if you've an existing working keyfob. Details on how to do this are freely available online.
You can buy the bits you need fairly cheaply off EBay, but you then need to find someone to program the transponder. It's the second part I'm having trouble with. If I can't find a key-cutting place/locksmith to do it fairly cheaply I think I might just have to go to the Nissan dealers to get it done.
I know there's some fairly complicated technology in these keys, but I can't see how they can justify charging as much as they do.
Basically if I understand correctly (feel free to correct me if I'm wrong here!) there are three components to the keys, each of which must be copied:
1. They physical key needs to be cut so you can open doors, insert into ignition etc (can be done cheaply at most key-cutting places).
2. The transponder chip in the key needs to be coded so that when you insert the key in the ignition, the immobiliser will let it start the engine. This can only be done by Nissan dealers or (I believe) some more advanced key-cutting places/locksmiths with the right equipment.
3. The remote central locking/alarm "Blip" part of the keyfob needs to be programmed to your vehicle. This can be done yourself if you've an existing working keyfob. Details on how to do this are freely available online.
You can buy the bits you need fairly cheaply off EBay, but you then need to find someone to program the transponder. It's the second part I'm having trouble with. If I can't find a key-cutting place/locksmith to do it fairly cheaply I think I might just have to go to the Nissan dealers to get it done.
I know there's some fairly complicated technology in these keys, but I can't see how they can justify charging as much as they do.