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 Service Manual: Advanced Smart Cruise Control (ASCC) Unit-Radar Description and Operation
Description The smart cruise control unit is installed on the front right side of the chassis.A radar sensor is embedded in the front section of the unit. This sensor detects vehicles and objects in front of the vehicle.The radar sensor can detect up to 64 objects ahead of a vehicle. The ...

Hyundai Sonata LF 2014-2019 Owners Manual: Before Starting
Make sure the hood, the trunk, and the doors are securely closed and locked. Adjust the position of the seat and steering wheel. Adjust the inside and outside rearview mirrors. Verify all the lights work. Fasten your seatbelt. Check that all passengers have fastened their seatbelts. Check the ...

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