NTK 25680 Air / Fuel Ratio Sensor - Upstream

Direct-Fit Air/Fuel Ratio Sensor for Honda and Acura

NTK 25680 is a direct-fit heated air/fuel ratio sensor built for upstream Bank 1 Sensor 1 applications. It is engineered for specific-fit replacement on select Honda and Acura models, including Honda Civic, CR-V, Accord, and Acura ILX, TLX, and TSX.

As part of NTK’s Direct Fit 4-Wire A/F Sensor line, this sensor is built around OE-style fit, form, and function for import and domestic coverage. NTK uses ceramic manufacturing expertise and extensive production testing to help deliver consistent signal performance and reliable emissions control service.

Key Features

• Part number: 25680
• Direct-fit heated air/fuel ratio sensor
• Specific-fit replacement for upstream Bank 1 Sensor 1 locations
• 4-wire design with 13.8 in. wiring harness length
• 18 mm thread diameter and 0.38 in. thread length
• Mounting bracket not included
• OE-style replacement for select Honda and Acura applications

Product Details

NTK 25680 is intended for vehicles that use an upstream air/fuel ratio sensor to monitor exhaust oxygen content and support fuel control. It is a direct replacement for select 2007-2020 Honda Fit, 2010-2019 Honda CR-V, 2008-2017 Honda Accord, 2012-2015 Honda Civic, 2013-2020 Acura ILX, and other listed Honda and Acura applications. This part cross-references Bosch 18064 for the same application.

NTK’s sensor line is developed with OE application coverage in mind, using controlled ceramic technology and manufacturing checks to help maintain accuracy and reliability. For shoppers searching for an NTK 25680 oxygen sensor, Honda Civic upstream air/fuel ratio sensor, or Acura ILX Bank 1 Sensor 1 replacement, this part provides a direct-fit option matched to the listed vehicles.

What It Helps Address

• Check engine light related to upstream oxygen or air/fuel ratio sensor faults
• Rough idle or unstable fuel trim caused by inaccurate sensor feedback
• Reduced fuel economy from incorrect air/fuel mixture control
• Emissions test failures tied to sensor response issues
• Driveability concerns on Honda and Acura vehicles with Bank 1 Sensor 1 faults

Installation Notes and Tips

• Verify the vehicle’s year, make, model, and upstream Bank 1 Sensor 1 location before ordering.
• Confirm the connector and harness routing match the original sensor.
• Inspect the exhaust bung threads before installation and clean as needed.
• Use proper sensor removal tools to avoid damaging the sensor or exhaust threads.
• Clear diagnostic trouble codes after installation and confirm live data response.

Quality Assurance

NTK is a major original equipment oxygen sensor manufacturer, and this sensor is manufactured and tested to meet or exceed OE specifications for the listed applications. The NTK 25680 is built for consistent fitment and dependable service in emissions control systems.