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How to Install a Ghost Immobiliser A ghost immobiliser is a hidden security system that protects your vehicle from key cloning and hacking. It works by preventing the engine of your vehicle from starting until it is activated using a PIN code, which can be up to 20 characters in length. It is undetectable by thieves and they are unlikely to be expecting this extra layer of security. Certain systems also come with an app that allows owners to disarm the immobiliser in case they forget their PIN