Hyundai Ioniq: Engine Control System / Heated Oxygen Sensor (HO2S). Repair procedures
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]. |
5. | Check that the resistance is within the specification. Specification : Refer to "Specification" |
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[Bank 1 / Sensor 1]
1. | Turn the ignition switch OFF and disconnect the battery negative (-) cable. |
2. | 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. |
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[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). 

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| Install the component with the specified torques. |
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| Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing. |
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| 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. |
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| Sensor and its wiring may be damaged in case of contacting with the exhaust system. (Exhaust Manifold, Catalytic Converter, and so on) |
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1. | 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) |
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