NTK 25158 Oxygen Sensor - Upstream Left or Upstream Right

Direct Fit Oxygen Sensor for Hyundai and Kia

NTK 25158 is a direct fit heated oxygen sensor built for specific upstream applications on select Hyundai and Kia vehicles. It is engineered for the 2002-2006 Hyundai XG350, 2003-2006 Hyundai Santa Fe, 2002-2005 Kia Sedona, 2003-2006 Kia Sorento, and 2004-2006 Kia Amanti, with upstream left and upstream right positions listed by application.

The NTK Direct Fit Oxygen Sensor line focuses on OE-style fit, form, and function. This sensor uses a threaded mounting design, a 4-wire configuration, an 18 mm thread diameter, and a 16.75-inch wiring harness length for direct replacement service.

• Part number: NTK 25158
• Heated oxygen sensor for upstream engine management applications
• Specific fit design for select Hyundai and Kia models
• 4-wire sensor with threaded mounting
• 18 mm thread diameter and 16.75-inch harness length
• OE-focused construction and manufacturing testing

Product Details and Fitment

NTK is known for oxygen sensor manufacturing and OE application coverage, and the Direct Fit Oxygen Sensor line is built to streamline replacement selection while maintaining original-equipment style performance. NTK 25158 is a direct replacement choice for drivers searching for an upstream oxygen sensor for Hyundai Santa Fe, Kia Sorento, Kia Sedona, Hyundai XG350, or Kia Amanti applications. This part cross-references Bosch 15659 for the same application.

Compatible vehicle applications include Fits 2003-2006 Hyundai Santa Fe, Upstream Right; Fits 2003-2006 Hyundai Santa Fe, Upstream Left; Fits 2004-2006 Kia Amanti, Upstream Right; Fits 2004-2006 Kia Amanti, Upstream Left; Fits 2003-2006 Kia Sorento, Upstream Right; Fits 2003-2006 Kia Sorento, Upstream Left; Fits 2004-2005 Hyundai XG350, Upstream Right; Fits 2004-2005 Hyundai XG350, Upstream Left; Fits 2002 Hyundai XG350, Upstream Right; Fits 2002 Hyundai XG350, Upstream Left; Fits 2002-2005 Kia Sedona, Upstream Right; Fits 2002-2005 Kia Sedona, Upstream Left; Fits 2003 Hyundai XG350, Upstream Right; Fits 2003 Hyundai XG350, Upstream Left.

What This Oxygen Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings from a worn upstream sensor
• Slow sensor response affecting fuel control
• Rough idle or drivability issues tied to sensor signal degradation
• Failed emissions inspection caused by sensor malfunction

Installation Notes and Tips

Confirm the vehicle year, make, model, and sensor position before ordering. This is a specific-fit, threaded oxygen sensor, so match the upstream left or upstream right location shown in the fitment data. Inspect the connector routing and harness length before installation, and verify the original sensor uses a 4-wire heated configuration.

Quality Assurance

NTK manufactures oxygen sensors with OE-level application focus and extensive production testing to support quality and reliability. The brand’s background as a major original equipment oxygen sensor supplier informs the design and coverage of NTK 25158 for select Hyundai and Kia applications.