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OE Quality
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NTK
Direct Fit Oxygen SensorNTK 25739 Oxygen Sensor - Downstream
| Brand | NTK 25739 |
|---|---|
| Position | Downstream |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 18.000 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 27.5000 |
| Product line | Direct Fit Oxygen Sensor |
| Fits | Kia and Hyundai · 85 vehicles |
Direct fit replacement. Specific-fit oxygen sensor for straightforward installation.
Heated sensor. Helps the sensor reach operating temperature quickly.
Threaded mounting. Installs with a secure, threaded connection.
Cross-references BBB Industries 13822, Bosch 16754 and DENSO Auto Parts 234-4568 for the same application. See all 10.
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Direct Fit Downstream Oxygen Sensor
NTK Oxygen Sensor 25739 is a direct fit, heated downstream oxygen sensor built for specific Hyundai and Kia applications. It uses a 4-wire, threaded design with an 18 mm thread diameter and a 27.5 in. wiring harness length for OE-style replacement on vehicles such as the Hyundai Elantra, Hyundai Sonata, Kia Soul, and Kia Optima.
Key Features
- Direct fit, specific application oxygen sensor for downstream placement
- Heated sensor design for faster operating response
- 4-wire configuration with 27.5 in. harness length
- 18 mm threaded mounting type for OE-style installation
- Built by NTK, a major original equipment oxygen sensor manufacturer
- Cross-references Bosch 16754 and DENSO 234-4568 for the same application
Product Details
NTK Direct Fit Oxygen Sensor 25739 is part of the NTK Sensor Specialist line, focused on import and domestic emission control coverage. NTK applies ceramic manufacturing expertise and OE application engineering to produce sensors with fit, form, and function aligned to original equipment requirements. This downstream oxygen sensor is engineered for vehicles that need precise exhaust monitoring after the catalytic converter, including Hyundai Elantra, Hyundai Ioniq, Hyundai Kona, and Kia Niro applications.
Compatible With 2020-2024 Hyundai Elantra, downstream; 2022-2023 Kia Seltos, downstream; 2020-2022 Hyundai Ioniq, downstream; 2020-2022 Kia Niro, downstream; and additional Hyundai and Kia models listed in the fitment data. Part number 25739 is also referenced by OE-style interchange numbers used across the same application range.
What This Sensor Helps Address
- Check engine light related to downstream oxygen sensor faults
- Incorrect exhaust oxygen readings after the catalytic converter
- Emissions test failures caused by sensor performance issues
- Rough fuel control feedback from a failing exhaust sensor
- Replacement needs after sensor wiring, heater, or signal degradation
Installation Notes and Tips
Install this sensor in the downstream position only where listed in the fitment data. Verify connector style, thread size, and harness length before installation, and confirm the vehicle application by year, make, and model. Because this is a specific-fit oxygen sensor, it is intended to replace the original sensor location without universal adaptation. Use proper exhaust sensor removal practices to avoid damage to the threaded mounting area.
Quality Assurance
NTK manufactures oxygen sensors to meet or exceed OE specifications and tests them during production for quality and reliability. As part of the NGK family of products, NTK supports OE application coverage for import and domestic vehicles. Part number 25739 is built to OE-equivalent design standards for the listed Hyundai and Kia applications.
This part fits 85 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2024 | Hyundai | Elantra | 1.6L | L4 | FULL HYBRID EV-GAS (FHEV) | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2023 | Hyundai | Elantra | 1.6L | L4 | FULL HYBRID EV-GAS (FHEV) | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2023 | Kia | Seltos | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2022 | Hyundai | Elantra | 1.6L | L4 | FULL HYBRID EV-GAS (FHEV) | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2022 | Hyundai | Ioniq | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2022 | Kia | Niro | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2022 | Kia | Seltos | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2021 | Hyundai | Elantra | 1.6L | L4 | FULL HYBRID EV-GAS (FHEV) | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2021 | Hyundai | Ioniq | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2021 | Hyundai | Kona | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2021 | Kia | Niro | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2021 | Kia | Seltos | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2020 | Hyundai | Elantra | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2020 | Hyundai | Elantra GT | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2020 | Hyundai | Ioniq | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2020 | Hyundai | Kona | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2020 | Kia | Niro | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2020 | Kia | Optima | 1.6L | L4 | — | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2019 | Hyundai | Accent | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2019 | Hyundai | Elantra | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2019 | Hyundai | Elantra | 1.4L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2019 | Hyundai | Elantra GT | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2019 | Hyundai | Ioniq | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2019 | Hyundai | Kona | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2019 | Hyundai | Sonata | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2019 | Kia | Niro | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2019 | Kia | Optima | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2019 | Kia | Rio | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2019 | Kia | Soul | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Hyundai | Accent | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Hyundai | Elantra | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Hyundai | Elantra | 1.4L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Hyundai | Elantra GT | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Hyundai | Ioniq | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Hyundai | Kona | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Hyundai | Sonata | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Hyundai | Tucson | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Kia | Forte5 | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Kia | Niro | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Kia | Optima | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Kia | Rio | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2018 | Kia | Soul | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Hyundai | Accent | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Hyundai | Elantra | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Hyundai | Elantra | 1.4L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Hyundai | Ioniq | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Hyundai | Sonata | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Hyundai | Tucson | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Hyundai | Veloster | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Kia | Forte Koup | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Kia | Forte5 | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Kia | Niro | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Kia | Optima | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Kia | Rio | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2017 | Kia | Soul | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2016 | Hyundai | Accent | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2016 | Hyundai | Sonata | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2016 | Hyundai | Tucson | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2016 | Hyundai | Veloster | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2016 | Kia | Forte Koup | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2016 | Kia | Forte5 | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2016 | Kia | Optima | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2016 | Kia | Rio | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2016 | Kia | Soul | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2015 | Hyundai | Accent | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2015 | Hyundai | Sonata | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2015 | Hyundai | Veloster | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2015 | Kia | Forte Koup | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2015 | Kia | Forte5 | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2015 | Kia | Rio | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2015 | Kia | Soul | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2014 | Hyundai | Accent | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2014 | Hyundai | Veloster | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2014 | Kia | Forte Koup | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2014 | Kia | Forte5 | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2014 | Kia | Rio | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2014 | Kia | Soul | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2013 | Hyundai | Accent | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2013 | Hyundai | Veloster | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2013 | Kia | Rio | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2013 | Kia | Soul | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2012 | Hyundai | Accent | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2012 | Hyundai | Veloster | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2012 | Kia | Rio | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2012 | Kia | Soul | 1.6L | L4 | — | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| No rows match your filter. | |||||||
Directly replaces or cross-references 10 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
BBB Industries — 13822Bosch — 16754DENSO Auto Parts — 234-4568234-4959392102B220392102B290392102B330392102B360392102B3703921003AA5