Operating Door Locks from Outside the Vehicle
Mechanical key

If you lock the driver's door with a mechanical key, all vehicle doors will lock. If you unlock the driver's door with a mechanical key, the driver's door will unlock and the passenger doors will unlock according to the current two press unlock setting.
Once the doors are unlocked, they may be opened by pulling the door handle.
When closing the door, push the door by hand. Make sure that doors are closed securely.
Remote key

To lock the doors, press the Door Lock button (1) on the remote key. Press the Door Unlock button (2) on the remote key, the driver's door will unlock. If you press the Door Unlock button on the remote key again within four seconds, then all the doors will unlock.
Once the doors are unlocked, they may be opened by pulling the door handle.
When closing the door, push the door by hand. Make sure that doors are closed securely.
Information
Immobilizer System
Smart keyHyundai Elantra AD (2016-2020) Service Manual: Fuel Tank Pressure Sensor (FTPS) Description and Operation
Description
Fuel Tank Pressure Sensor (FTPS) is a component of the
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the fuel pump, or the canister. It checks the purge control solenoid
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Hyundai Elantra AD (2016-2020) Owners Manual: Resetting the System
The last break time is set to 00:00 and the driver's attention level is
set to 5 (very attentive) when the driver resets the Driver Attention Warning
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