If the Smart Key does not operate normally, you can lock or unlock the door by using the mechanical key.
Press and hold the release button (1) and remove the mechanical key (2). Insert the mechanical key into the key hole on the door.
To reinstall the mechanical key, put the key into the hole and push it until a click sound is heard.
Hyundai Sonata LF 2014-2019 Service Manual: Master Cylinder Repair procedures
Removal
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the air cleaner assembly (A).
3.
Disconnect the brake fluid level switch connector (A).
4.
Remove the brake fluid from the master cylinder reservoir with a syringe.
†...
Hyundai Sonata LF 2014-2019 Owners Manual: All Season Tires. Summer Tires. Snow Tires
All Season Tires
HYUNDAI specifies all season tires on some models to provide good performance
for use all year round, including snowy and icy road conditions. All season tires
are identified by ALL SEASON and/or M+S (Mud and Snow) on the tire sidewall. Snow
tires have better snow traction than a ...