Kia Cee'd: Engine Control System / Heated Oxygen Sensor (HO2S) Description and operation

Heated Oxygen Sensor (HO2S) consists of zirconium and alumina and is installed both upstream and downstream of the Manifold Catalytic Converter. The sensor output voltage varies in accordance with the air/fuel ratio.

The sensor must be hot in order to operate normally. To keep it hot, the sensor has a heater which is controlled by the ECM via a duty cycle signal. When the exhaust gas temperature is lower than the specified value, the heater warms the sensor tip.

Knock Sensor (KS) Repair procedures

Removal 1. Turn the ignition switch OFF and disconnect the battery negative (-) cable. 2. Remove the intake manifold. (Re ...

Heated Oxygen Sensor (HO2S) Specifications

Specification HO2S [Bank 1/Sensor 1]   Item Specification Heater Resistance (Ω) 2.4 ~ 4.0 [20°C(68°F)] ...

Other information:

Kia Cee'd JD Service Manual: Troubleshooting
Troubleshooting Ignition System   Symptom Suspect Area Remedy Engine will not start or is hard to start (Cranks OK) Ignition lock switch Inspect ignition lock switch, or replace as requ ...

Kia Cee'd JD Service Manual: Ambient Temperature Sensor Repair procedures
Inspection 1. Turn the ignition switch OFF. 2. Disconnect the ambient temperature sensor. 3. Check the resistance of the ambient temperature sensor between terminal “+” and “-” whether it is c ...