OE Quality
60-Day Returns

NTK 25156 Oxygen Sensor - Upstream
Overview of NTK Direct Fit Oxygen Sensor 25156 for Kia Rio
The NTK Direct Fit Oxygen Sensor 25156 is designed specifically for Kia Rio models, ensuring precise emission control and optimal engine performance. This heated oxygen sensor features a threaded mounting type and a 9.25-inch wiring harness for straightforward installation.
- Heated oxygen sensor for accurate exhaust gas monitoring
- Specific fit for Kia Rio vehicles
- Threaded mounting with 18mm thread diameter
- 9.25-inch wiring harness length for proper connection
- Four-wire design for reliable signal transmission
Detailed Product Description
The NTK Direct Fit Oxygen Sensor 25156 is engineered to meet the exact specifications of Kia Rio models, providing a direct replacement for the factory sensor. Its heated sensor type allows for faster warm-up times, improving fuel efficiency and reducing emissions. The sensor’s 18mm threaded mounting ensures a secure fit, while the 9.25-inch wiring harness length accommodates the vehicle’s factory wiring layout. With four wires, this sensor supports both the heating element and signal output, maintaining accurate oxygen level readings for the engine control unit.
Applications and Problem Solving
- Restores proper air-fuel mixture control in Kia Rio engines
- Resolves check engine light issues related to oxygen sensor faults
- Improves fuel economy by providing accurate exhaust data
- Reduces harmful emissions by ensuring efficient combustion
- Prevents engine performance problems caused by faulty sensors
Installation Notes and Tips
Installation of the NTK Direct Fit Oxygen Sensor 25156 is straightforward due to its specific fit design for Kia Rio models. Ensure the engine is cool before removal to avoid burns. Use a proper oxygen sensor socket to prevent damage to the sensor or wiring. Verify the wiring harness length and connector compatibility before installation. After installation, clear any diagnostic trouble codes to reset the engine control unit.
Quality Assurance and Warranty
NTK’s Direct Fit Oxygen Sensor line is manufactured to meet OEM standards, ensuring reliable performance and durability. This sensor undergoes rigorous testing to comply with emission control requirements. While specific warranty details are not provided here, NTK products typically come with a limited warranty covering defects in materials and workmanship.
| Brand | NTK |
| Part Number | 25156 |
| 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 | 9.2500 |
This part fits 3 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2003 | Kia | Rio | 1.6L | L4 | Upstream | Bank 1 Sensor 1 Oxygen Sensor; Direct Fit Oxygen Sensor |
| 2002 | Kia | Rio | 1.5L | L4 | Upstream | Bank 1 Sensor 1 Oxygen Sensor; Direct Fit Oxygen Sensor |
| 2001 | Kia | Rio | 1.5L | L4 | Upstream | Bank 1 Sensor 1 Oxygen Sensor; 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.