Standards for anti-theft devices and immobilisers for new vehicles are specified in EU type approval law. These standards have been adopted at EU level following extensive consultation with vehicle manufacturers and with member states. All new cars sold within the European Union must be fitted with immobilisers that conform to the standards. Under internal market rules it is not possible for an individual member state to depart from the approved specifications without the agreement of the European Commission and the other member states.
The purpose of the NCT is to determine the roadworthiness of a vehicle and the checks on anti-theft devices are solely with that objective in mind.