Only the chips ID is written to the car the car does not have the ability to write back to the chip so the required coding needs to be on the chip first. When you program the chip to a Fiat the chip is already locked and already contains the required information. This is because you program an unlocked chip to a VW and the car writes the required information into the chip locks it and writes the chips ID to the car. You can take one off the shelf and program it to lots of cars many VW's use exactly the same chip and up to around 2005 you can program it to the car as it comes from the factory. If just taking the Megamos 48 crypto transponder as used on the mk2 Puntos as an example. Robert G8RPI.Fiat do things a little differently to most. It is certainly worth trying adding the keys from the other car. I think you may be combining the two ways of making a new key. I don't have a Punto and have not done this with Fiat keys, but I am an electronics engineer and have used these components professionally in a number of applications. Both have the same number so the car accepts both. They read the code in one key and make a "clone" transponder. this is how Timpsons etc can make a copy without accessing the car. Some transponders can be programmed with any number, after it is fitted to the key. To add a key to a car the list in the ECU is updated to include the new number. This is why you can't use a Fiat key on a VW). The number is nomally programmed at manufacture and is essentially random (it's a long number and some parts are the same and restricted to certain customers etc. The key transponder (apart from the latest types) just returns a number when interrogated. All the systems I know of program the car with a list of valid keys.
No you can't use them the chips in the keys are car specific.Hi,
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