NTK 25151 Oxygen Sensor - Downstream Right, Upstream or Upstream Right

NTK Direct Fit Oxygen Sensor 25151

NTK Direct Fit Oxygen Sensor 25151 is a heated, specific-fit oxygen sensor built for select Hyundai and Kia applications. It is engineered with a 4-wire design, 18 mm thread diameter, and a 12.5 in. wiring harness length for OE-style replacement on the listed vehicles.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• Specific-fit design for direct replacement on listed Hyundai Sonata, Hyundai XG300/XG350, and Kia Amanti applications
• 4-wire configuration with threaded mounting
• 18 mm thread diameter and 12.5 in. wiring harness length
• NTK Direct Fit Oxygen Sensor line focuses on OE application coverage and form-fit-function matching

Product Details

NTK part number 25151 is part of the Direct Fit Oxygen Sensor line, a product family focused on OE-style replacement for import and domestic vehicles. NTK uses ceramic sensor technology and manufacturing controls from raw material through finished sensor production, then tests sensors during manufacturing to help ensure quality and reliability that meet or exceed OE specifications. This oxygen sensor is listed for 1999-2005 Hyundai Sonata, 2001 Hyundai XG300, 2002-2005 Hyundai XG350, and 2004-2006 Kia Amanti applications, including upstream and downstream right positions where specified.

This part cross-references Bosch 13753 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn upstream sensor
• Slow sensor response that can affect fuel control
• Downstream catalyst monitoring faults on listed Hyundai and Kia vehicles
• Hard-to-match replacement needs for OE-style threaded sensor locations

Installation Notes and Tips

Verify the vehicle year, engine configuration, and sensor position before ordering. This NTK 25151 oxygen sensor is a specific-fit replacement, so connector style, harness length, and mounting location should match the original sensor on the vehicle. Confirm whether the application calls for upstream or downstream right placement, such as B1S1 or B1S2, before installation.

Quality Assurance

NTK is the sensor specialist within the NGK family of products and is a major original equipment oxygen sensor supplier. The Direct Fit Oxygen Sensor line is manufactured and tested to support OE-level fit, form, and function for the listed applications.