Even if you remove the "guts" from your old key, the 2012 Prius C at least has a programmed chip that cannot be physically removed from the old key without damaging it. So you have to program the chip into this new key. On a positive note, this key comes with all the electronics - it wasn't actually blank inside. That means you pay the locksmith one thing less: you pay for teething and programming, but you don't have to pay for a new chip or electronics.
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