Probably around $200. First you have to get a new key made. Dealership can make you a dummy one (it won't start the car and they can't program it without an existing or red key) or you can find a locksmith to cut and program the key to your immobilizer, it still probably won't start the car. Then you have to send out your ecu to have the immobilizer chip remove, then you'll be able to start it.
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