NTK 25671 Oxygen Sensor

NTK Direct Fit Oxygen Sensor 25671

NTK Direct Fit Oxygen Sensor 25671 is a heated, specific-fit oxygen sensor built for precise replacement in select Hyundai and Kia applications. It is designed with a 4-wire configuration, 18 mm threaded mounting, and a 13-inch wiring harness length for OE-style routing and connection.

For drivers servicing Hyundai Genesis Coupe, Hyundai Veracruz, Hyundai Azera, Hyundai Genesis, Kia Borrego, Hyundai Entourage, Hyundai Sonata, Kia Sedona, Hyundai Santa Fe, Kia Amanti, and Kia Sorento applications, this NTK oxygen sensor supports direct replacement needs across upstream and downstream positions.

Key Features

• Heated oxygen sensor for faster operating temperature and emissions-system feedback
• Specific-fit design for direct replacement on listed Hyundai and Kia vehicles
• 4-wire construction for OE-style signal and heater circuit layout
• 18 mm threaded mounting for factory-style installation points
• 13-inch wiring harness length for proper sensor routing
• NTK Direct Fit Oxygen Sensor line focuses on OE application coverage and form-fit-function replacement

OE-Style Replacement Design

NTK is the Sensor Specialist for import and domestic applications, and this oxygen sensor reflects that OE-focused approach. NTK manufactures oxygen sensors with controlled ceramic technology and extensive production testing to help deliver fit, form, and function that meet or exceed OE specifications. Part number 25671 is a direct-fit replacement for select upstream and downstream positions on 2006-2012 Hyundai and Kia models, including Hyundai Sonata, Hyundai Azera, and Kia Sedona applications.

This part cross-references Bosch 15337 and DENSO Auto Parts 234-4854 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Faulty air-fuel ratio feedback from a worn upstream sensor
• Slow heater response in a heated oxygen sensor circuit
• Emissions test failures tied to sensor signal degradation
• Incorrect fuel trim readings on affected Hyundai and Kia vehicles

Installation Notes

Verify the sensor position before installation, since fitment includes upstream left, upstream right, downstream left, and downstream right locations depending on the vehicle. Confirm the connector routing, thread size, and harness length against the original sensor before removal. For best results, inspect the exhaust threads and wiring path, and follow the vehicle service procedure for sensor replacement.

Fits 2010-2012 Hyundai Genesis Coupe, upstream left; fits 2010-2012 Hyundai Genesis Coupe, downstream right; fits 2010-2012 Hyundai Genesis Coupe, downstream left; fits 2007-2012 Hyundai Veracruz, upstream left; fits 2007-2012 Hyundai Veracruz, downstream left; fits 2006-2011 Hyundai Azera, upstream right; fits 2006-2011 Hyundai Azera, upstream left; fits 2006-2011 Hyundai Azera, downstream left; fits 2009-2011 Hyundai Genesis, downstream right; fits 2009-2011 Hyundai Genesis, downstream left; fits 2009-2011 Kia Borrego, upstream left; fits 2009-2011 Kia Borrego, downstream right; fits 2009-2011 Kia Borrego, downstream left; fits 2007-2010 Hyundai Entourage, upstream right; fits 2007-2010 Hyundai Entourage, upstream left; fits 2007-2010 Hyundai Entourage, downstream left; fits 2006-2010 Hyundai Sonata, upstream right; fits 2006-2010 Hyundai Sonata, upstream left; fits 2006-2010 Hyundai Sonata, downstream left; fits 2006-2010 Kia Sedona, upstream right; fits 2006-2010 Kia Sedona, upstream left; fits 2006-2010 Kia Sedona, downstream left; fits 2007-2009 Hyundai Santa Fe, upstream left; fits 2007-2009 Hyundai Santa Fe, downstream left; fits 2007-2009 Kia Amanti, upstream right; fits 2007-2009 Kia Amanti, upstream left; fits 2007-2009 Kia Amanti, downstream left; fits 2007-2009 Kia Sorento, upstream left.

Quality Assurance

NTK is the original equipment oxygen sensor supplier for a wide range of import and domestic vehicle platforms. Each sensor is manufactured and tested to support OE-level reliability and application accuracy for the listed Hyundai and Kia fitments.