When the air bags inflate, they make a loud noise and they leave smoke and powder in the air inside of the vehicle. This is normal and is a result of the ignition of the air bag inflator. After the air bag inflates, you may feel substantial discomfort in breathing due to the contact of your chest with both the seat belt and the air bag, as well as from breathing the smoke and powder. Open your doors and/or windows as soon as possible after impact in order to reduce discomfort and prevent prolonged exposure to the smoke and powder.
Though smoke and powder are nontoxic, it may cause irritation to the skin (eyes, nose and throat, etc.). If this is the case, wash and rinse with cold water immediately and consult the doctor if the symptom persists.
WARNING

How does the air bag system
operate
Do not install a child restraint on the
front passenger’s seatKia Cee'd JD Service Manual: Description and operation
Warning Lamp Activation
Warning Lamp Behavior after Ignition
On
As soon as the operating voltage is applied to the SRSCM ignition input, the
SRSCM activates the warning lamp for a LED lamp check.
The lamp shall turn on for 6 seconds during the initialization ...
Kia Cee'd JD Service Manual: Cylinder Head Components and components location
Components
1. Cylinder head assembly
2. MLA
3. Retainer lock
4. Retainer
5. Valve stem seal
6. Valve spring
7. Valve spring seat
8. OCV (Oil Control Valve)
9. Exhaust valve
10. Intake valve
11. Cylinder head gasket
...