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. ...

Removal and installation
To remove the headrest, raise it as far as it can go then press the release button (1) while pulling upward (2). To reinstall the headrest, put the headrest poles (3) into the holes while pressin ...

ADVANCED STANDARD SAFETY TECHNOLOGIES: PART OF HYUNDAI'S ASSURANCE COMMITMENT
Hyundai Sonata is built from the ground up with safety in mind, with a hot stamped ultra-high-strength steel body structure, advanced airbag technology and Electronic Stability Control (ESC), deli ...