Kia Optima: Check spark plugs and ignition 
system - Winter driving - Driving your vehicle - Kia Optima TF 2011-2021 Owners ManualKia Optima: 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.

Change to "winter weight" oil if necessary
In some climates it is recommended that a lower viscosity "winter weight" oil be used during cold weather. See section 8 for recommendations. If you aren't sure what weight oil y ...

To keep locks from freezing
To keep the locks from freezing, squirt an approved de-icer fluid or glycerine into the key opening. If a lock is covered with ice, squirt it with an approved de-icing fluid to remove the ice. ...

See also:

Windshield Deicer Switch Repair procedures
Inspection 1. The windshield deicer switch inputs can be checked using the GDS. 2. To check the input value of windshield deicer switch, select option "Body Control Module". 3. Select opti ...

High Voltage Shut-off Procedures
High Voltage Shut-off Procedures     Be sure to read and follow the “General Safety Information and Caution” before doing any work related with the high voltage sys ...

Starting the Engine
1. Make sure the parking brake is applied. 2. Manual Transmission - Depress the clutch pedal fully and shift the transmission into Neutral. Keep the clutch pedal depressed while turning the ignitio ...

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