Other information:
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 ...
Hyundai Sonata LF 2014-2019 Service Manual: Important Safety Notice
General Information
Proper service methods and repair procedures are essential
for safe, reliable operation of all motor vehicles as well as personal
safety of the operator. The service procedures and descriptions in this
shop manual provide general directions for a service and repair.
...