Kia Optima: Tire ReplacementIf the tire is worn evenly, a tread wear indicator will appear as a solid band 1/2 inch wide (12.7 mm) across the the tread. This shows there is less than 1/16 inch (1.6 mm) of tread left on the tire. Replace the tire when this happens.
Do not wait for the band to appear across the entire tread before replacing the tire.

Tire Rotation
Compact Spare Tire ReplacementDescription
Body control module receives various input switch signals controlling time and alarm
functions for the intermittent wiper timer, washer timer, rear defogger timer, seat
belts warning, central ...
Windshield washers
In the OFF position, pull the lever gently toward you to spray washer fluid on
the windshield and to run the wipers 1-3 cycles.
Use this function when the windshield is dirty.
The spray and wipe ...
Canister Close Valve (CCV). Description and Operation
Description
Canister Close Valve (CCV) is installed on the canister ventilation
line. It seals evaporative emission control system by shutting the canister
from the atmosphere when leakage dete ...