This warning light illuminates for 3 seconds after the ignition switch is set to the ON position and then it will go out. If it lights up while the engine is running, it indicates that water has accumulated inside the fuel filter. If this happens, remove the water from the fuel filter.
For more details, refer to “Fuel filter” in chapter 7.
CAUTION
When the fuel filter warning light illuminates, engine power (vehicle speed & idle speed) may decrease. If you keep driving with the warning light on, you can damage your vehicle's engine parts and injection system of the Common Rail. If this occurs, we recommend that the system be checked by an authorized Kia dealer.
Kia Cee'd JD Service Manual: Timing Chain Cover Repair procedures
Removal
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Use fender covers to avoid damaging painted surfaces.
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To avoid damage, unplug the wiring connectors carefully while
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Kia 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 ...