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Simply put, a vehicle immobiliser is there to stop your car from functioning if it notices that someone is trying to start your car when they are not authorised to do so. Modern cars are set up so that your key or fob communicates with your ECU.
That is short for Electrical Control Unit, which approves the car’s engine starting. If someone has broken into your car and they are trying to drive it without the unique code that is in your key or fob, then the ECU will not allow your car to start. Different immobilisers will do this in different ways, but the end result is the same.
A good immobiliser will also notify the car owner or the associated security provider that someone is attempting to move your car without permission. They may also trigger your car’s alarm.
The truth is that car thieves are getting more and more sophisticated. While many cars have good security options already installed, the best way to give yourself peace of mind and protect your vehicle is to take these additional steps. A few years ago, it was reported that they had caused a 40% reduction in car theft.