What does it mean when a car displays 'nokey'?

[Lindsey]

It may be caused by the smart key being too far from the car's one-button start sensing distance, the smart key running out of battery, or the smart key being damaged. Below is more information about car keys: Composition: The car smart key system, abbreviated as PKE, is a control system consisting of a transmitter, a remote central control module, a driving authorization system control module, three receivers, and related wiring harnesses. Usage: When the key approaches the car, the door will automatically unlock and the anti-theft alarm will be deactivated, accompanied by corresponding light flashes to remind the owner that the car is unlocked. When the key moves a certain distance away from the car, the door will automatically lock and the anti-theft alarm will be activated, accompanied by corresponding light flashes or a brief horn sound to remind the owner that the car is locked.