On a 2005 the remote fob just does the central locking and alarm.
The immobiliser is a completely different system consisting of a chip in the key that communicates with a Sawdoc immobiliser ECU via the coil on the ignition barrel.
You can buy a replacement key with a chip already programmed from a LR main dealer parts department and it probably isn't as expensive as you think.
As far as I know, the key/chip will "just work" without needing the service department to get involved.
 
I think my key is a recut from a blank, but how it is in a LR holder intrigues me. I do have a chip in mine. 2005 Facelift.
 

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I think my key is a recut from a blank, but how it is in a LR holder intrigues me. I do have a chip in mine. 2005 Facelift.
Do you happen to have the dimensions for the chip? I doubt anything like that would fit my key, although they're branded as 'chippable'. I don't have it on me ATM so can't post a picture. I'm hoping my car is old enough to rely on the fob for the immo, as the chips seem impossible to get, but replacement fobs can still be bought.
 
Do you happen to have the dimensions for the chip? I doubt anything like that would fit my key, although they're branded as 'chippable'. I don't have it on me ATM so can't post a picture. I'm hoping my car is old enough to rely on the fob for the immo, as the chips seem impossible to get, but replacement fobs can still be bought.
I shall update you with the exact dimensions next week when I arrive home. 👍🏻
 

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