here's my 20 cents...
I agree that a Nanocom would be better value here, but it won't be of any use on "Merlin" which is a Disco 1. It will however be useable on any P38 of the same type (GEMS, Motronic or Diesel).
The FaultMate MSV2 (Nano or Extreme) is more expensive than a Nanocom and they are usually sold locked to a single VIN unless you buy the more expensive multi-vehicle licence. However, with a FaultMate you can also purchase modules that apply to a Disco 1 if you want. With a Nanocom, you can buy additional Unlock Codes for other P38 types, Disco 2 (V8 and TD5) and Defenders (TD5 and Puma). Don't think they have added any other vehicles yet, or if they will.
Back to the P38...
The alarm can certainly be disabled.
Passive Immobilisation can be switched off... this is the immobilisation that occurs about 30 secs after you switch the engine off and do not lock the doors. Now, what I am not sure about is whether this applies to all P38's or only the 99+ models.
The immobilisation that occurs when the Engine ECU and BeCM lose synch cannot be disabled. If and when this occurs, you need a tool like FaultMate, Nanocom or Sync-Mate to reset it.
I believe you can also disable the EKA by entering 0000 in the EKA field with Nanocom or FaultMate.
Hope this doesn't confuse things too much.
Cheers, Paul.
BTW: in my view, carrying a Nanocom in my glove box is as important as having a good spare tyre ;) (No, I don't sell them).

