Kia Optima: Starting the engine with a smart key
1. Carry the smart key or leave it inside the vehicle.
2. Make sure the parking brake is firmly applied
3. Automatic Transaxle - Place the transaxle shift lever in P (Park). Depress the brake pedal fully.
4. Press the ENGINE START/STOP button while depressing the brake pedal.
5. In extremely cold weather (below -18°C (0°F)) or after the vehicle has not been operated for several days, let the engine warm up without depressing the accelerator.
Whether the engine is cold or warm, it should be started without depressing the accelerator.
WARNING
The engine will start, only when the smart key is in the vehicle. Never allow children or any person who is unfamiliar with the vehicle touch the ENGINE START/STOP button or related parts.
CAUTION
If the engine stalls while the vehicle is in motion, do not attempt to move the shift lever to the P (Park) position. If the traffic and road conditions permit, you may put the shift lever in the N (Neutral) position while the vehicle is still moving and press the ENGINE START/STOP button in an attempt to restart the engine.

✽ NOTICE
CAUTION
Do not press the ENGINE START/ STOP button for more than 10 seconds except when the stop lamp fuse is blown.
Starting the engine with an ignition key
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Installation
1.
Install the heater control unit.
2.
Install the center fascia lower
panel.
3.
Install the crash pad garnish.
...