Kia Forte BD Quiz
Engine Control System/Fuel System

Heated Oxygen Sensor (HO2S)

In this manual: Engine Control System/Fuel System
General Information — 8Maintenance — 32Engine Mechanical System — 47Engine Electrical System — 17Emission Control System — 10Engine Control System/Fuel System — 32Clutch System — 11Manual Transmission — 11DCT (Dual Clutch Transmission) System — 16Drive Shaft and Axle — 8Suspension System — 26Steering — 9Restraints — 11Brake System — 27Body (Interior and Exterior) — 119Body Electrical System — 98Heating, Ventilation, and Air Conditioning — 27
8steps
~58min
4/5difficulty
2special tools
02040608010049.136N·mlb·ft
Tightening torque found on this page
Done 0 of 8

Specifications

Specification

HO2S [Bank 1 / Sensor 1] (Linear Type)

Item Specification
Heater Resistance (Ω) 2,4–4,0 [20 °C]

HO2S [Bank 1 / Sensor 2] (Binary Type)

A/F Ratio (λ) Output voltage (V)
RICH 0,6 - 1,0
LEAN 0 - 0,4

Item Specification
Heater Resistance (Ω) approx. 9.0 [20 °C]

Description and Operation

Description

The Heated Oxygen Sensor (HO2S) is composed of zirconia and alumina and is installed both upstream and downstream of the catalytic converter. The sensor output voltage changes depending on the air-fuel ratio.

For proper operation, the sensor must be hot. To keep it hot, the sensor has a heater which is controlled by the ECM with a duty cycle signal. When the exhaust gas temperature is lower than the specified value, the heater warms the sensor tip.

Circuit Diagrams

Wiring Diagram

Harness Connector

HO2S [Bank 1 / Sensor 1]

HO2S [Bank 1 / Sensor 2]

Repair Procedures

Inspection

  1. Turn the ignition off.

  2. Disconnect the HO2S connector.

  3. Measure the resistance between terminals 2 and 5 [B1/S1] of the HO2S.

    Specification: 2.4–4.0 [20 °C]

  4. Measure the resistance between terminals 3 and 4 [B1/S2] of the HO2S.

    Specification: Approximately 9.0 [20 °C]

  5. Make sure the resistance is within specification.

Removal and Installation

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

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

    Heated Oxygen Sensor:

    39,2–49 N·m

    [Bank 1/Sensor 1]

    [Bank 1/Sensor 2]

  3. Install in the reverse order of removal.

Test yourself

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