You need the electronic "clickie" key to reset it.
Else try this:
http://www.rangerovers.net/repairdet...ecm/alarm.html
Generic EKA Procedure on NAS Range Rovers
The EKA feature does not seem to be enabled on US vehicles, or Australian ones, and is not mentioned in their owners' handbooks. However there does seem to be an abbreviated version of the procedure available on NAS models, intended to be known only by Land Rover dealers and using a generic code (1515) for all vehicles. One US owner with a 2000 Range Rover had his vehicle stranded with a dead battery and no remote available, but when jumpering it got the message "Engine Disabled, Press Remote". Since he did not have a remote, he managed to reactivate the vehicle using a variant of the EKA procedure that the dealer confided -- the dealer was fairly sure that almost all NAS P38's have the same EKA code, which is:
Unlock once
lock 5 times,
unlock once,
and then lock 5 times.
Aidan confirms that he found out from Land Rover that the normal EKA is not applicable to US spec P38A Range Rovers, but the generic "null" code (1515) is used. For example, when replacing a BECM it asks for the code and a null # is inputted (1515).
