The above situations are normal conditions when the active eco system is activated to improve fuel efficiency.
Kia Cee'd JD Service Manual: Heated Oxygen Sensor (HO2S) Specifications
Specification
HO2S [Bank 1/Sensor 1]
Item
Specification
Heater Resistance (Ω)
2.4 ~ 4.0 [20°C(68°F)]
HO2S [Bank 1/Sensor 2]
A/F Ratio (λ)
Output Voltage(V)
...
Kia Cee'd JD Service Manual: PTC Heater (Gasoline Engine) Description and operation
Descriptionddd
The PTC (Positive Temperature Coefficient) heater is installed at the exit or
the backside of the heater core.
The PTC heater is an electric heater using a PTC element as an auxiliary heating
device that supplements deficiency of interior heat source in high ...