If the fuel filler door does not open using the remote fuel filler door release button, you can open it manually. Pull the release located on the left side of the trunk compartment.
Hyundai Sonata LF 2014-2019 Owners Manual: Malfunction Indicator Lamp (MIL)
This warning light illuminates:
Once you set the ignition switch or Engine Start/Stop button to the ON position.
- It remains on until the engine is started.
When there is a malfunction with the emission control system. In this case,
have your vehicle inspected by an authorized HYUNDAI dealer ...
Hyundai Sonata LF 2014-2019 Service Manual: Repair procedures
Refrigerant System Service Basics
Refrigerant Recovery
Use only service equipment that is U.L-listed and is
certified to meet the requirements of SAE J2210 to remove HFC-134a
(R-134a) from the air conditioning system.
•
Air conditioning refrigerant or lubricant v ...