Kia Rio YB Quiz
Engine Control System/Fuel System

Heated Oxygen Sensor (HO2S)

In this manual: Engine Control System/Fuel System
General Information — 8Maintenance — 31Engine Mechanical System — 44Engine Electrical System — 14Emission Control System — 9Engine Control System/Fuel System — 30Clutch System — 10Manual Transmission — 10Automatic Transmission — 23Drive Shaft and Axle — 8Suspension System — 15Steering — 9Restraints — 14Brake System — 22Body (Interior and Exterior) — 115Body Electrical System — 84Heating, Ventilation, and Air Conditioning — 28
7steps
~52min
4/5difficulty
2special tools
02040608010049.136N·mlb·ft
Tightening torque found on this page
Done 0 of 7

Specifications

Specification

Heated Oxygen Sensor (HO2S)

HO2S [Bank 1 / Sensor 1]

Item Specification
Heater Resistance (Ω) Approximately 9.0 [20 °C]
Type Binary
Pin 4

HO2S [Bank 1 / Sensor 2]

Item Specification
Heater Resistance (Ω) Approximately 9.0 [20 °C]
Type Binary
Pin 4

Description and Operation

Description

The heated oxygen sensor (HO2S) consists of zirconia and alumina and is installed at the inlet and outlet of the warm-up catalytic converter (WCC).

After comparing the oxygen content of the atmosphere with that of the exhaust gas, it sends a corresponding voltage signal to the ECM. When the A/F ratio is rich or lean, it generates approximately +1 V or 0 V, respectively.

For this sensor to operate properly, the sensor tip temperature must be above a specified temperature. Therefore, it has a heater that is controlled by the ECM duty signal. When the exhaust gas temperature is below the specified value, the heater heats the sensor tip.

Circuit Diagrams

Wiring Diagram

Repair Procedures

Inspection

  1. Check the HO2S sensor signal waveform using KDS/GDS.

    Specification: Refer to "Waveform"

  2. Turn the ignition off.

  3. Disconnect the HO2S connector.

  4. Measure the resistance between terminals 3 and 4 of the HO2S sensor heater.

  5. Make sure the resistance is within specification.

    Specification: approximately 9.0 Ω [20 °C]

Removal

  1. Turn the ignition switch OFF and disconnect the negative (-) battery terminal.

  2. Disconnect the connector (A) and remove the sensor (B).

    Installation of the heated oxygen sensor:

    39,2–49 N·m

    [Bank 1/Sensor 1]

    [Bank 1/Sensor 2]

Installation

  1. Installation is the reverse of removal.

Troubleshooting

Waveform

[Sensor 1, 2]

[Bank 1/Sensor 1]

[Bank 1/Sensor 2]

Test yourself

A quick Kia Rio YB quiz: every answer comes with an explanation and a link to the manual page.