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If the key wont physically turn lock , you have probably damaged the key slightly. This can happen if you drop keys etc . Check for any burrs or damage to key. rub any burrs with fine sandpaper, make sure key not bent and its going all the way into lock.
bit of graphite powder in lock may help
Im pretty sure the key models don't check key code till key turns in lock.
Immobiliser rf id chip in key head is not dependant on battery
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