Locking from Outside

The doors can be locked without a key. To lock the doors, first push the inside lock switch to the "LOCK" position so that the red mark on the switch is not visible, then close the door.
NOTE:
o When pushing the lock switch of the passenger's door to the "LOCK" position, all doors can be locked.
o If your vehicle is equipped with the central door locking system, the door will not lock if the key is left in the ignition switch when the front doors are closed.
o When locking the door from outside, be careful not to lock the door with the ignition key left in the vehicle.
o To protect against theft, always remove the ignition key, close all windows, and lock all doors and the trunk lid (4 Door) / tail gate (3 Door) when leaving your vehicle unattended.
See also:
Check spark plugs and ignition system
Inspect your spark plugs as described in section 7 and replace them if necessary.
Also check all ignition wiring and components to be sure they are not cracked, worn
or damaged in any way. ...
Record Your Key Number
A code number is recorded on the number tag that came with the keys to your Hyundai.
This key number tag should not be left with the keys but kept in a safe place, not
in the vehicle. The key nu ...
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An advanced four-wheel independent suspension system combines a supple ride
with precise handling and steering response for Hyundai Sonata GLS and Limited
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