This is part of the report given to me by Nissan:
Error Code B2191 Difference of Key
Description:
Performs ID verification through BCM and Intelligent Key when push-button ignition switch is pressed. Prohibits the release of steering lock (models with steering lock unit) or start of engine when an unregistered ID of Intelligent Key is used.
And yes, I agree, the physical key not matching the door tumblers shouldn't matter at all... but apparently I do need a whole new "registered" keyfob. But I still don't understand why I didn't have this problem a long, long time ago.
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