I have some very recent experience in this area .....
Firstly it is unlikely to be the key that's the problem.
The Engine Disabled message means the security code between the BeCM and the engine ECU is out of sync. This needs to be re synced, as you said with a faultmate or similar.
PaulP38a is in the Canberra area and may be able to help you out.
For a longer term fix you will need to check your door latch mechanism and possible replace it, and possibly it is also a sign your BeCM itself is on the way out as was mine, and it had exactly the same symptoms.
For the door mechanism, a quick check can be to pull out the rubber boot between the door and the body of the car and you will find 2 wiring harness connectors. Examine them to make sure they are clean and in good condition. If not clean them up - it can affect the communication between the door lock and the BeCM.
Dave
2011 Range Rover Sport SDV6 Autobiography
2007 Range Rover Sport TDV6
2004 Freelander TD4 SE
1997 Range Rover 4.6 HSE
1994 Range Rover Vogue
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