Hyundai Ioniq: Engine Control System / Heated Oxygen Sensor (HO2S). Repair procedures

Hyundai Ioniq (AE) 2017-2025 Service Manual / Engine Control/Fuel System / Engine Control System / Heated Oxygen Sensor (HO2S). Repair procedures

Inspection

1.	Turn the ignition switch OFF.

2.	Disconnect the HO2S connector.

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

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

Check that the resistance is within the specification.

Specification : Refer to "Specification"

Removal

[Bank 1 / Sensor 1]

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

Disconnect the connector (A), and then remove the sensor (B).

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

[Bank 1 / Sensor 2]

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

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

Installation

•	Install the component with the specified torques.

•	Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.

•	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)

Install in the reverse order of removal.

Heated oxygen sensor installation :

39.2 - 49.1 N.m (4.0 - 5.0 kgf.m, 28.9 - 36.2 lb-ft)

Heated Oxygen Sensor (HO2S). Schematic diagrams

C..

Exhaust Gas Temperature Sensor (EGTS). Description and operation

DescriptionInstalled in exhaust manifold, the Exhaust Gas Temperature Sensor (EGTS) #1 for EWGA senses the temperature of exhaust gas flowing into the EWGA...

Other information:

Hyundai Ioniq (AE) 2017-2025 Owner's Manual: Charging System Warning Light, Engine Oil Pressure Warning Light

Charging System Warning Light When this warning light illuminates while running the engine, the battery is not being charged. Immediately turn OFF all electrical accessories. Try not to use electrically operated controls, such as the power windows...

Hyundai Ioniq (AE) 2017-2025 Service Manual: Condenser. Repair procedures

Inspection1.Check the condenser fins for clogging and damage. If clogged, clean them with water, and blow them with compressed air. If bent, gently bend them using a screwdriver or pliers.2.Check the condenser connections for leakage, and repair or replace it, if required...