Hyundai Elantra N Owner's Manual page 142

Digital key (Card key) deletion
You should have the smart key to delete
digital key (card key). Please have the
smart key in your possession.
1. Get into the vehicle with the smart
key.
2.
Settings menu after turning on the
engine.
With Navigation screen : From the
infotainment screen menu, go to
[Setup] - [Vehicle] - [Digital Key] -
[Card Key] then select the [Delete]
from submenu.
Without navigation screen : From
cluster menu, go to [Digital Key] -
[Card Key] and select [Delete].
If there is no saved digital key(card key),
[Delete] menu will not be activated.
To delete the saved digital key (card
key), the smart key must be inside the
vehicle.
The deleted digital key (card key) can
be re-registered before registering a
new digital key (card key).
If you register a new digital key (card
key), the previously registered digital
key (card key) cannot be used again.
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