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: Repair procedures
Teaching Procedures 1. Key Teaching Procedure Key teaching must be done after replacing a defective PCM(ECM) or when providing additional keys to the vehicle owner. The procedure starts with an PCM(ECM) request for vehicle specific data (PIN code: 6digits) from the tester. The "virgin" PCM ...

Hyundai Sonata LF 2014-2019 Service Manual: Muffler Repair procedures
Removal and Installation Front Muffler 1. Disconnect the battery negative terminal. 2. Disconnect the rear oxygen sensor connector (A). 3. Remove the front muffler (A). Tightening torque: 39.2 ~ 58.8 N.m (4.0 ~ 6.0 kgf.m, 28.9 ~ 43.4 lb-ft) 4. Install in the reverse order of ...

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