You can start the engine without inserting the key.
NOTICE
To prevent damaging the smart key:
NOTICE
Always have the smart key with you when leaving the vehicle. If the smart key is left near the vehicle, the vehicle battery may be discharged.
Hyundai Sonata LF 2014-2019 Owners Manual: Recommended Lubricants and Capacities
To help achieve proper engine and powertrain performance and durability, use
only lubricants of the proper quality. The correct lubricants also help promote
engine efficiency that results in improved fuel economy.
Recommended SAE viscosity number
CAUTION
Always be sure to clean the area around a ...
Hyundai Sonata LF 2014-2019 Owners Manual: Smart key precautions
The smart key will not work if any of the following occur:
The smart key is close to a radio transmitter such as a radio station or
an airport which can interfere with normal operation of the transmitter.
The smart key is near a mobile two way radio system or a cellular phone.
Another vehicleâ ...