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: Winter Precautions
Use high quality ethylene glycol coolant
Your vehicle is delivered with high quality ethylene glycol coolant in the cooling
system. It is the only type of coolant that should be used because it helps prevent
corrosion in the cooling system, lubricates the water pump and prevents freezing.
Be sure ...
Hyundai Sonata LF 2014-2019 Service Manual: Intake Manifold Repair procedures
Removal and Installation
1.
Remove the engine cover.
2.
Disconnect the battery negative terminal.
3.
Disconnect the engine wiring connector and haness clamp and disconnect the wiring from intake manifold.
4.
Disconnect the PCV (Positive crankcase ventilation) hose (A) and the PCSV ( ...