How does a car immobiliser work?

Answer

A car immobiliser disables one of the systems needed to start a car's engine, usually the fuel supply or the ignition. This is accomplished by RF identification between a transponder in the ignition key and a device called a RF reader in the steering column. The transponder sends a signal with a unique identification code to the reader, which relays it to a receiver in the vehicle's computer control module.

A car immobiliser is an anti-theft mechanism that prevents an automobile's engine from starting unless the correct ignition key (or Key FOB) is inserted into the ignition slot. One of the advantages of an immobiliser system is that the car owner does not have to remember to activate it - its operation is automatic. The device is considered as a passive anti-theft system since it does not require action from a person to make it work. One disadvantage of the system is that car keys with the embedded transponder are more expensive and time consuming to replace if lost and usually requires a visit to a car dealer. Most new vehicles have an immobiliser as standard equipment, but aftermarket or add-on immobilisers are available for older cars or vehicles without factory-installed immobilisers.

Q&A Related to "How does a car immobiliser work?"
An immobilizer or immobilizer is an electronic device fitted to an automobile which prevents the engine from running unless the correct key (or other token) is present.
http://wiki.answers.com/Q/What_is_Immobiliser_in_c...
its an anti theft device too prevent people from stealing your car it will shut down the fuel and ignition systems so that the engine cant be started leaving your car immobile. most
http://answers.yahoo.com/question/index?qid=200902...
Sid, don't pass that security code around so easily! You never know who's reading your question. I don't post anything that will assist in breaking security or by-passing key systems
http://en.allexperts.com/q/Land-Rover-Repair-1470/...
The immobilizer system is there so nobody start your car, only if they have an authorize key. Only the dealer has a Bidirectional scanner that interacts with the immobilizer ecu,
http://www.fixya.com/cars/t7438146-reset_car
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