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Hyundai Tucson: Heated Oxygen Sensor (H02S)

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Engine Control - Fuel System / Heated Oxygen Sensor (H02S)

Description

Heated Oxygen Sensor (HO2S) consists of the zirconium and the alumina and is installed on upstream and downstream of the Manifold Catalyst Converter (MCC).

In order that this sensor normally operates, the temperature of the sensor tip is higher than 370ºC (698º F). So it has a heater which is controlled by the ECM duty signal.

When the exhaust gas temperature is lower than the specified value, the heater warms the sensor tip.

Specification

Specification

Bank 1 / Sensor 1

Bank 1 / Sensor 2

Bank 1 / Sensor 2

Circuit Diagram

Circuit Diagram

Harness Connector HO2S Bank 1 / Sensor 1

Harness Connector HO2S Bank 1 / Sensor 1

HO2S Bank 1 / Sensor 2

HO2S Bank 1 / Sensor 2

Inspection

Inspection

  1. Turn the ignition switch OFF.
  2. Disconnect the HO2S connector.
  3. Measure resistance between HO2S heater terminals 2 and 5. B1 / S1 Measure resistance between HO2S heater terminals 3 and 4. B1 / S2
  4. Check that the resistance is within the specification.

Bank 1 / Sensor 1

Bank 1 / Sensor 2

Bank 1 / Sensor 2

Removal

Removal

  1. Turn ignition switch OFF and disconnect the battery negative (-) terminal.
  2. Disconnect the heated oxygen sensor connector (A).
  3. Remove the heated oxygen sensor (B).

Tightening Torque : 39.2 - 49.0 N.m (4.0 - 5.0 kgf.m, 28.9 - 36.1 lb-ft)

WARNING

Note that the SST (Part No. : 09392-2H100 or 09392-1Y100) is useful when removing the heated oxygen sensor.

HO2S Bank 1 / Sensor 1

HO2S Bank 1 / Sensor 1

HO2S Bank 1 / Sensor 2

HO2S Bank 1 / Sensor 2

Installation

Installation

WARNING

  • Install the component with the specified torques.
  • Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.

WARNING

  • DON'T use a cleaner, spray, or grease to sensing element and connector of the sensor because oil component in them may malfunction the sensor performance.
  • Sensor and its wiring may be damaged in case of contacting with the exhaust system (Exhaust Manifold, Catalytic Converter, and so on).
  1. Install in the reverse order of removal.

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