Hyundai Sonata LF: Ignition System / Spark Plug Description and Operation
A spark plug is a device for delivering electric current from
an ignition system to the combustion chamber of a spark-ignition engine
to ignite the compressed fuel/air mixture therein by means of an
electric spark, while containing combustion pressure within the engine. A
spark plug has a metal threaded shell, electrically isolated from a
central electrode by a porcelain insulator.

Removal
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the engine cover.
3.
Disconnect the ignition coil connector (A)...
Other information:
C..
Replacememt
1.
Pull down rear door window glass by pressing the power window glass switch.
2.
Remove the rear door belt outside weatherstrip (A).
3.
Install in the reverse order of removal.
•
Replace any damaged clips...