The immobilizer can be reprogrammed with a PIWIS or PST2 to no longer recognize the old key codes for wireless unlocking or starting the car. The mechanical door lock will still open, but that is it. If you buy a new key and have it programmed, any dealer or indie should be willing to do this little extra bit for nil or close. Justmake sure to take any "good" keys with you so they can tell what to deprogram.
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