NTK 25195 Oxygen Sensor - Upstream Left

Direct Fit Oxygen Sensor for Kia and Hyundai

The NTK Direct Fit Oxygen Sensor 25195 is a heated, threaded replacement sensor built for specific upstream left applications. It is engineered for direct fitment on select Kia and Hyundai models, including the Kia Optima, Kia Magentis, Kia Rondo, and Hyundai Santa Fe.

Key Features

• Direct fit oxygen sensor for specific vehicle applications
• Heated sensor design for faster operating response
• 4-wire configuration
• Threaded mounting type with 18 mm thread diameter
• 8.5 in. wiring harness length
• Fits upstream left position, Bank 2 sensor 1

Product Details

NTK part number 25195 is part of the Direct Fit Oxygen Sensor line, a product range focused on OE-style fit, form, and function for import and domestic vehicles. NTK develops oxygen sensors with in-house ceramic expertise and manufacturing control from raw material through finished sensor, supporting consistent performance and application coverage. This sensor is built for select 2006-2010 Kia Optima, 2006-2010 Kia Magentis, 2007-2012 Kia Rondo, and 2007-2009 Hyundai Santa Fe applications in the upstream left location. This part cross-references Bosch 15651 for the same application.

Common Uses

• Replacing a failed upstream oxygen sensor on a Kia Optima
• Restoring air-fuel feedback on a Kia Magentis or Kia Rondo
• Addressing check engine light concerns related to Bank 2 sensor 1
• Correcting fuel trim issues caused by a worn heated oxygen sensor
• Replacing an OE-style sensor on a Hyundai Santa Fe

Installation Notes

Verify the upstream left, Bank 2 sensor 1 location before installation. Confirm the 4-wire connector, threaded mounting style, and 18 mm thread diameter match the original sensor. Compare the harness length to the vehicle routing path before final installation. Use the vehicle’s service information to confirm exact application by year, make, and model.

Quality Assurance

NTK states that its oxygen sensors are extensively tested during manufacturing to help ensure quality and reliability that meet or exceed OE specifications. The brand is a major original equipment oxygen sensor supplier, and the Direct Fit line is built to support accurate replacement on confirmed applications.