NTK 25690 Air / Fuel Ratio Sensor

Overview of NTK Direct Fit 4-Wire A/F Sensor 25690

The NTK Direct Fit 4-Wire Air/Fuel Ratio Sensor 25690 is designed specifically for select INFINITI and Nissan vehicles, including the G37 and Murano models. This heated sensor provides accurate air/fuel mixture readings to help maintain optimal engine performance and emissions control.

• Heated sensor type for faster response times
• Four-wire design for precise signal transmission
• Specific fit for INFINITI G37 and Nissan Murano
• Thread diameter of 18.0 mm and thread length of 0.38 inches
• Wiring harness length of 14.8 inches for direct fit installation
• Mounting bracket not included

About the Direct Fit 4-Wire A/F Sensor Product Line

The NTK Direct Fit 4-Wire A/F Sensor line is engineered to provide exact replacement sensors that match OEM specifications for specific vehicle applications. This product line focuses on delivering sensors with a heated element and four-wire configuration to ensure reliable air/fuel ratio monitoring and compatibility with factory wiring harnesses. The 25690 part number is part of this line, offering a direct fit solution for INFINITI and Nissan models requiring precise emission control components.

Detailed Product Description

The NTK 25690 air/fuel ratio sensor features a heated sensor element that allows it to reach operating temperature quickly, improving sensor response and reducing emissions during cold starts. Its four-wire design supports accurate voltage signal transmission to the engine control unit (ECU), enabling precise fuel mixture adjustments. The sensor’s thread diameter of 18.0 mm and thread length of 0.38 inches ensure a secure and proper fit in the exhaust system. With a wiring harness length of 14.8 inches, this sensor is designed for a direct fit installation without the need for modifications. This sensor is specifically engineered for the INFINITI G37 and Nissan Murano, ensuring compatibility and reliable performance.

Common Applications and Issues Addressed

• Restores accurate air/fuel ratio readings for proper engine management
• Helps resolve rough idling and poor fuel economy caused by faulty sensors
• Reduces emissions by providing correct data to the ECU
• Prevents check engine light triggers related to air/fuel sensor faults
• Improves overall engine performance and drivability

Installation Notes and Tips

When installing the NTK 25690 sensor, ensure the vehicle is cooled down to avoid burns. Use appropriate tools to remove the old sensor and avoid damaging the thread. The 14.8-inch wiring harness length allows for a direct connection to the factory harness without splicing. Do not overtighten the sensor; follow manufacturer torque specifications. Since no mounting bracket is included, use the existing mounting points on the vehicle.

Quality Assurance and Warranty

NTK sensors are manufactured to meet or exceed OEM standards for durability and performance. The Direct Fit 4-Wire A/F Sensor 25690 undergoes rigorous testing to ensure reliable operation under various driving conditions. Warranty coverage details should be confirmed with the original parts provider or vehicle manufacturer.