NTK 25154 Oxygen Sensor - Downstream Left or Upstream Left

Direct Fit Oxygen Sensor for Import Applications

NTK Direct Fit Oxygen Sensor 25154 is a heated, specific-fit replacement built for precise OE-style installation and signal performance. It is engineered for select Hyundai and Kia applications, including 2001 Hyundai XG300, 2002-2003 Hyundai XG350, and 2002-2005 Kia Sedona.

Key Features

• Heated oxygen sensor design for faster operating temperature
• Specific-fit configuration for direct replacement use
• 4-wire design with a 22-inch wiring harness
• Threaded mounting with 18 mm thread diameter
• Built by NTK, a major OE oxygen sensor manufacturer
• Direct fit for downstream left and upstream left locations on listed vehicles

Product Details

NTK part number 25154 is part of the Direct Fit Oxygen Sensor line, a product line focused on OE-style replacement coverage for import and domestic vehicles. NTK uses ceramic manufacturing expertise and controlled production processes to maintain fit, form, and function across its oxygen sensor range. This sensor is extensively tested during manufacturing to support quality and reliability that meet or exceed OE specifications. This part cross-references Bosch 15562 for the same application.

Fits 2002-2005 Kia Sedona, downstream left. Fits 2003 Hyundai XG350, downstream left. Fits 2002 Hyundai XG350, downstream left. Fits 2001 Hyundai XG300, upstream left. These applications cover B2S2 replacement on the Sedona and bank 2 sensor 1 service on the XG300.

Common Issues This Sensor May Resolve

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the engine control module
• Slow sensor response from an aging heated oxygen sensor
• Emissions test failure caused by a faulty upstream or downstream sensor
• Driveability concerns tied to inaccurate exhaust oxygen readings

Installation Notes and Tips

Confirm the sensor location before installation: downstream left or upstream left, depending on the vehicle application. Verify the 4-wire connector, 22-inch harness length, and 18 mm threaded mounting point match the original sensor. For best results, compare the original connector routing and exhaust placement before tightening the sensor into the threaded bung.

Quality Assurance

NTK is the Sensor Specialist and a long-standing OE oxygen sensor supplier. Part number 25154 is manufactured and tested to support dependable replacement performance for the listed Hyundai and Kia applications.