HomeEmission Control > SensorsNTK 25156 Oxygen Sensor - Upstream
Part #: 25156

NTK 25156 Oxygen Sensor - Upstream

Direct Fit Oxygen Sensor, Upstream
⚙️ 3 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$54.80Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
📦Direct Fit Oxygen Sensor, Upstream
🚗Fitment: Kia, Rio
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

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.

BrandNTK
Part Number25156
PositionDirect Fit Oxygen Sensor, Upstream
Mounting TypeThreaded
Sensor TypeHeated
Thread Diameter18.000
Universal Or Specific FitSpecific
Wire Quantity4
Wiring Harness Length9.2500

This part fits 3 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2003KiaRio1.6LL4UpstreamBank 1 Sensor 1 Oxygen Sensor; Direct Fit Oxygen Sensor
2002KiaRio1.5LL4UpstreamBank 1 Sensor 1 Oxygen Sensor; Direct Fit Oxygen Sensor
2001KiaRio1.5LL4UpstreamBank 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:

0K32A188611531415324234-4117OS5154SG1085

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.