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How to Install a Ghost Immobiliser Ghost immobilisers protect your vehicle from key cloning and hacking. It prevents the engine from running until it is started with PIN codes that is up to 20 characters in length. It is not detected by thieves, who are unlikely to expect this extra layer of security. Certain systems also come with an application that lets owners disarm the immobiliser in case they forget their PIN code or to use the service/valet mode. Connecting to the vehicle's CAN