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How to Install a Ghost Immobiliser Ghost immobilisers are hidden security device that protects your vehicle from key cloning and hacking. It works by preventing the engine of your vehicle from starting unless it is started using PIN codes that is up to 20 characters in length. This extra layer of protection isn't visible to thieves who may not be expecting it. Certain systems come with an app that allows the owner to disarm their immobiliser in the event of forgetting their PIN number or use service/valet mode