NTK 25678 Oxygen Sensor - Upstream Left or Upstream Right

Direct Fit Oxygen Sensor for Hyundai and Kia

The NTK Direct Fit Oxygen Sensor 25678 is a heated, specific-fit replacement built for select Hyundai and Kia applications. It is engineered for threaded mounting and OE-style signal response, making it a practical choice for drivers replacing a worn upstream sensor on vehicles such as the Hyundai Genesis Coupe, Veracruz, Santa Fe, Genesis, and Kia Borrego or Sorento.

NTK’s Direct Fit Oxygen Sensor line focuses on OE application coverage and precise fitment. This sensor uses NTK’s ceramics expertise and manufacturing controls to deliver consistent sensor construction from raw material through finished product, with testing performed during production to help meet OE specifications.

Key Features

• NTK Direct Fit Oxygen Sensor, part number 25678
• Heated oxygen sensor with 4-wire design
• Specific fit for select Hyundai and Kia vehicles
• Threaded mounting type with 18 mm thread diameter
• 18.75 in. wiring harness length
• OE-style fit, form, and function for emission control service

Detailed Description

NTK 25678 is a direct replacement oxygen sensor for emission control service on select Hyundai and Kia models. It is listed for upstream right and upstream left positions depending on application, including Fits 2010-2012 Hyundai Genesis Coupe, Upstream Right; Fits 2007-2012 Hyundai Veracruz, Upstream Right; Fits 2009-2011 Hyundai Genesis, Upstream Left; Fits 2009-2011 Kia Borrego, Upstream Right; Fits 2007-2009 Hyundai Santa Fe, Upstream Right; and Fits 2007-2009 Kia Sorento, Upstream Right. This part cross-references DENSO Auto Parts (e.g., 234-4263, 234-4464) for the same application.

As part of NTK’s Direct Fit Oxygen Sensor line, this unit is built for streamlined replacement coverage and OE application support. It is a practical option when servicing air/fuel ratio monitoring on the Hyundai Genesis Coupe, Hyundai Veracruz, or Kia Sorento with the correct factory position and connector layout.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air/fuel ratio readings from a failing upstream sensor
• Slow or unstable sensor response during closed-loop operation
• Emission control faults tied to sensor signal degradation
• Driveability issues caused by inaccurate exhaust oxygen feedback

Installation Notes and Tips

Verify the vehicle year, engine configuration, and sensor position before ordering. This sensor is specific fit and uses a threaded mounting style, so confirm the upstream right or upstream left location against the original part. Inspect the harness routing and connector match before installation, and follow the vehicle service procedure for sensor removal and torque specification.

Quality Assurance

NTK is a major original equipment oxygen sensor manufacturer, and this Direct Fit Oxygen Sensor is manufactured and tested to support OE-level fit and performance expectations. The brand’s ceramics and sensor technology background supports consistent construction and application coverage for import and domestic emission control service.