Your vehicle may be equipped with the ISG system, which reduces fuel consumption by automatically shutting down the engine, when the vehicle is at a standstill. (For example : red light, stop sign and traffic jam)
The engine starts automatically as soon as the starting conditions are met.
The ISG system is ON whenever the engine is running.
✽ NOTICE
When the engine automatically starts by the ISG system, some warning lights (ABS, ESC, ESC OFF, EPS or Parking brake warning light) may turn on for a few seconds.
This happens because of low battery voltage. It does not mean the system has malfunctioned.
Kia Cee'd JD Service Manual: Crankshaft Position Sensor (CKPS) Repair procedures
Inspection
1.
Check signal waveform of CKPS and CMPS using a GDS.
Specification: Refer to “Waveform”
Removal
1.
Turn the ignition switch OFF and disconnect the battery negative ...
Kia Cee'd JD Service Manual: Filler-Neck Assembly Repair procedures
Removal
1.
Lift the vehicle.
2.
Disconnect the fuel filler hose (A), leveling hose (B) and the ventilation
hose (C).
3.
Open the fuel filler door and then remove the filler-neck installation
...