NTK 25700 Air / Fuel Ratio Sensor - Upstream

NTK Direct Fit A/F Sensor 25700

NTK 25700 is a direct-fit heated air/fuel ratio sensor for specific Honda upstream applications. It is built with a 4-wire design and OE-style dimensions to match the original sensor location and signal requirements.

Key Features

• Direct Fit 4-Wire A/F Sensor for specific upstream applications
• Heated sensor design for faster operating temperature
• 10.8 in. wiring harness length
• 18.000 mm thread diameter with 0.38 in. thread length
• Specific-fit replacement for OE-style installation
• No mounting bracket included

Product Details

NTK 25700 is part of the Direct Fit 4-Wire A/F Sensor line, a product line focused on OE-style replacement sensors for import and domestic vehicles. NTK uses ceramic sensor technology and manufacturing controls from raw material through finished sensor to support consistent fit, form, and function. This sensor is engineered for upstream air/fuel ratio monitoring on Honda applications, including 2006-2015 Honda Civic, 2014-2015 Honda Accord, and 2016-2020 Honda HR-V. If you are replacing an upstream Bank 1 Sensor 1 unit on a Honda Civic, Honda Accord, or Honda HR-V, NTK 25700 provides a direct-fit service part reference for the original location.

This part cross-references Bosch 15268 for the same application.

What It Helps Address

• Check engine light related to upstream air/fuel ratio sensor faults
• Incorrect fuel trim readings from a worn or slow-responding sensor
• Rough idle or drivability issues tied to inaccurate exhaust feedback
• Emissions test failures caused by sensor performance degradation
• OE sensor replacement needs on Honda Civic, Accord, and HR-V models

Installation Notes

Verify the connector, thread size, and upstream Bank 1 Sensor 1 location before installation. Use the vehicle’s original routing path for the 10.8 in. harness to avoid strain or heat damage. Confirm the sensor threads cleanly into the exhaust bung and follow the manufacturer service procedure for torque and connector engagement.

Quality Assurance

NTK is a major OE oxygen sensor manufacturer and tests sensors during production to support quality and reliability that meet or exceed OE specifications. The 25700 is built for direct-fit service on confirmed Honda applications and reflects NTK’s OE-focused sensor engineering.