Transponder Car keys
The transponder Car keys are used by the top notch car manufacturers like Ford, Toyota, Nissan, Chevrolet, BMW, etc. since they were tested in all the German and non-German models by 1998. The concept of the chip keys came into existence to reduce the car theft risk.
Transponder keys has a computer microchip that is electronically encoded and embedded in a plastic body. It was first introduced in 1995 and is still used to the day. The code in the microchip is crucial in detecting the car keys when inserted in the ignition. The code has to be matched to enable the key to start the car engine.
When the car key is turned in the ignition, the engine control unit (ECU) on the car sends an electronic message to the key, and it will allow the car to start only provided it receives the correct message back. So even for a simple car key without any buttons, the key must be cut correctly to turn the locks and also programmed correctly to disarm the immobiliser. Car keys with chips can be programmed by special programmers.
The microchip in the transponder gets broken or misplaced, then it will not be possible to start the car up. An ultimate way of solving such a problem is by reprogramming the immobilizer control so as to match it with the new car key with the new reprogrammed code. This process may cost a lot, depending on the model of the car, as well as other factors such as your specific location and the level of urgency.
It was very easy for the automotive locksmith to generate a duplicate car key and anyone could easily get a key duplicated and would steal your car. The hot wiring method to steal the car, does not work now as most of the cars use the transponder key.
Car key replacements have become a difficult and a costly task. You need to go for the car key programming after you get the key cut by the automotive locksmith.