Hyundai Sonata: Smart Key / Loss of a smart key

A maximum of two Smart Keys can be registered to a single vehicle. If you happen to lose your smart key, you should immediately take the vehicle and remaining keys to your authorized HYUNDAI dealer or tow the vehicle, if necessary.

Mechanical key
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 mechanic ...

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 tran ...

Other information:

Hyundai Sonata LF 2014-2019 Owners Manual: Closing the fuel filler door
1. To install the fuel tank cap, turn it clockwise until it "clicks" one time. 2. Close the fuel filler door until it is latched securely. WARNING Gasoline is highly flammable and explosive. Failure to follow these guidelines may result in SERIOUS INJURY or DEATH: Read and follow all warnings pos ...

Hyundai Sonata LF 2014-2019 Service Manual: Smart Key Diagnostic Repair procedures
Inspection Self Diagnosis with Scan Tool It will be able to diagnose defects of SMART KEY system with GDS quickly. GDS can operates actuator forcefully, input/output value monitoring and self diagnosis. The following three features will be major problem in SMART KEY system. 1. Problem in ...

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