OK bit confused as to “the security circuit” and the “the chip being at fault” yet you say Key1 will start the car which means the chip is not at fault and you certainly don't need to pay that much to get this sorted.
As I understand it the circuit board and chip are two independent items, the circuit board talks to the BCU and the chip (stored in the back of the keyfob) talks to the immobiliser (EWS).
If the circuit board from Key2 operates the remote locking then it should also do so even if you place it in the key1 fob. It doesn’t even have to be placed in the fob, you can operate the remote locking with just the circuit board in your hand and pressing the micro switches with your finger. Sorry but this makes little sense to me, perhaps someone else can better advise.
Regards
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