Ignition key (Nissan Almera N15)

The key number may be required if all existing keys are lost and a duplicate cannot be made. A Nissan dealer can make a duplicate from any of the existing keys.

CAUTION! When leaving the vehicle, do not leave the key in the ignition.

Models equipped with NATS V2.0 anti-theft device (with a gasoline engine)

If you require an additional NATS V2.0 key, you will need to know the key number. Up to four NATS keys can be used on one vehicle. Any new key must be paired with the NATS anti-theft device installed on your vehicle. To do this, contact your Nissan dealer and provide them with all available keys.

This is because during the merging procedure all previous information will be erased from the NATS device memory.

The material is taken from a web resource (nissanbook.ru)