What is Immobilizer and why is it important?

The Immobilizer prevents the car from running unless an authorized key is present and has been properly matched to various components in the vehicle. Several different Immobilizer schemes have been used for different years and different models of vehicles with different procedures that apply to them. The components of the Immobilizer system that require special procedures for replacement include the keys, Engine controller (ECU), and the Instrument Cluster (or the separate Immobilizer modules in vehicles so equipped). In some cases other Modules or Parts may be Immobilizer related as well, for example newer Audi Models also have the Transmission as Part of the Immobilizer.

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