NTK 25691 Oxygen Sensor - Downstream Right

Direct Fit Oxygen Sensor for Sorento

NTK 25691 is a direct fit heated oxygen sensor for the downstream right position on 2007-2009 Kia Sorento models. It is built for specific-fit replacement service, with a threaded mounting design and a 4-wire configuration for straightforward OE-style replacement.

NTK’s Direct Fit Oxygen Sensor line focuses on application-specific coverage and OE-style fit, form, and function. As part of NTK’s sensor lineup, this oxygen sensor is manufactured with ceramic technology and tested during production to support consistent signal performance and reliable emissions-system operation.

Key Features

• Direct fit oxygen sensor for the downstream right location
• Fits 2007-2009 Kia Sorento, downstream right
• Heated sensor design for faster operating temperature response
• Specific-fit replacement for OE-style installation
• 4-wire configuration with 33.5-inch wiring harness length
• Threaded mounting type with 18 mm thread diameter
• NTK part number 25691 for catalog and cross-reference use

Detailed Description

NTK 25691 is an emission control oxygen sensor engineered for the 2007-2009 Kia Sorento downstream right position. This direct fit oxygen sensor is built to match the original equipment equivalent design, helping maintain proper exhaust feedback for the engine management system. The heated sensor layout supports quicker sensor activation after startup, while the specific-fit construction helps simplify replacement on the Sorento platform. This part number, 25691, is a practical OE-style choice for drivers and technicians servicing downstream oxygen sensor faults on the Kia Sorento.

This part cross-references Bosch 18152 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Fault codes tied to oxygen sensor response or signal issues
• Reduced emissions-system feedback accuracy
• Rougher fuel control caused by incorrect exhaust oxygen readings
• Replacement needs after sensor aging, contamination, or electrical failure

Installation Notes and Tips

Verify the downstream right sensor location before installation on the 2007-2009 Kia Sorento. Confirm thread size, connector routing, and harness length against the original sensor to ensure proper fit. Use care when removing the old sensor from the exhaust stream, and inspect the connector and wiring path for heat damage or corrosion before completing the repair.

Quality Assurance

NTK is a major original equipment oxygen sensor manufacturer, and its sensors are extensively tested during production to meet or exceed OE specifications. The Direct Fit Oxygen Sensor line is built to support accurate fitment and dependable emissions-system service for import and domestic applications.