OE Quality
60-Day Returns

NTK 25606 Oxygen Sensor - Upstream
Overview of NTK Direct Fit Oxygen Sensor 25606
The NTK Direct Fit Oxygen Sensor 25606 is designed specifically for select Hyundai and Kia models, including the Elantra, Sportage, Tiburon, and Tucson. This heated oxygen sensor features a threaded mounting type and a precise 18mm thread diameter, ensuring a secure and accurate fit for your vehicle's emission control system.
- Heated oxygen sensor for improved response time
- Specific fit for Hyundai Elantra, Kia Sportage, Tiburon, and Tucson
- Threaded mounting with 18mm thread diameter
- Wiring harness length of 8.75 inches with 4 wires
- Part number 25606 for easy identification
Detailed Product Description
This NTK oxygen sensor belongs to the Direct Fit Oxygen Sensor product line, which is engineered to provide a precise replacement for original equipment sensors. The Direct Fit Oxygen Sensor line focuses on exact fitment and reliable performance, reducing installation time and ensuring compatibility with the vehicle’s engine management system. The 25606 sensor is a heated type, which helps the sensor reach operating temperature faster, improving fuel efficiency and emissions control.
With a wiring harness length of 8.75 inches and four wires, this sensor integrates seamlessly with the vehicle’s existing wiring. The threaded mounting type with an 18mm diameter allows for straightforward installation and a secure connection. This sensor is designed specifically for Hyundai and Kia vehicles, including the Elantra, Sportage, Tiburon, and Tucson models, ensuring proper fit and function.
Common Applications and Issues Addressed
- Helps maintain optimal air-fuel mixture for efficient combustion
- Reduces engine misfires and rough idling
- Improves fuel economy by providing accurate oxygen level readings
- Prevents increased emissions and failed emissions tests
- Resolves check engine light issues related to oxygen sensor faults
Installation Notes and Tips
- Ensure the vehicle is cool before installation to avoid burns
- Use proper tools to avoid damaging the sensor or threads
- Verify the wiring harness length and connector compatibility before installation
- Follow vehicle manufacturer torque specifications for sensor installation
- Clear any diagnostic trouble codes after installation to reset the engine control unit
Quality Assurance and Warranty
NTK oxygen sensors are manufactured to meet or exceed OEM specifications, ensuring reliable performance and durability. The Direct Fit Oxygen Sensor 25606 undergoes rigorous testing to confirm proper operation under various driving conditions. While specific warranty details may vary, NTK typically offers coverage against defects in materials and workmanship to provide confidence in your purchase.
| Brand | NTK |
| Part Number | 25606 |
| Position | Direct Fit Oxygen Sensor, Upstream |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 18.000 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 8.7500 |
This part fits 18 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2010 | Kia | Sportage | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2009 | Hyundai | Tucson | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2009 | Kia | Sportage | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2008 | Hyundai | Tucson | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2008 | Kia | Sportage | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2007 | Hyundai | Tucson | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2007 | Kia | Sportage | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2006 | Hyundai | Tiburon | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2006 | Hyundai | Tucson | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2006 | Kia | Sportage | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2005 | Hyundai | Tiburon | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2005 | Hyundai | Tucson | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2005 | Kia | Sportage | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2004 | Hyundai | Tiburon | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2003 | Hyundai | Elantra | 2.0L | L4 | Upstream | B1S1; 4-Wire Oxygen Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2003 | Hyundai | Tiburon | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2002 | Hyundai | Elantra | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 2001 | Hyundai | Elantra | 2.0L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.