that would depend on the nature of the fault and this is bordering onto thread hijack territory...
If you know the systems of an engine well enough you dont need the computer to diagnose them and the defender td5 does not do "lockdowns" as soon as you repair a fault thats triggering the check engine and putting you out of action it will let you go with full steam again.
the disco can but the lockdown problems are usually related to the immobilizer and alarm system.
The kicker is this. anything thats out of someone whose semi handy with the spanners and knows the basics of diesel suck squeeze bang blow can fix it and what will stop both you and the country greaser is parts regardless of the engine presented.
Take a Rave Cd with you and the catalog from fourwheel drives in melbourne and with a half decent workshop I reckon I could build you a td5 from nothing up, install it and get you running again. Anywhere, and so could any other greaser who reckoned they knew how to change the piston rings on a 4 stroke lawn mower.

