NTK 25591 Oxygen Sensor - Downstream or Intermediate

Overview of NTK Direct Fit Oxygen Sensor 25591

The NTK Direct Fit Oxygen Sensor 25591 is designed specifically for select Volvo models, including the S40, S60, S70, V50, and V70. This heated oxygen sensor ensures accurate emissions monitoring and optimal engine performance by providing precise air-fuel mixture data to the vehicle's engine control unit.

• Heated sensor type for faster response times
• Specific fit for Volvo S40, S60, S70, V50, and V70 models
• 32-inch wiring harness length for convenient installation
• Threaded mounting type with 18mm thread diameter
• Four-wire configuration for reliable signal transmission

Details on the Direct Fit Oxygen Sensor Product Line

The NTK Direct Fit Oxygen Sensor line is engineered to provide exact replacement sensors that match the original equipment specifications. This ensures compatibility and performance consistency for vehicles requiring precise emission control components. The 25591 sensor maintains the integrity of the vehicle’s emission system by delivering accurate oxygen level readings, which are critical for maintaining fuel efficiency and reducing harmful exhaust emissions.

Technical Description and Features

This oxygen sensor features a heated element that allows it to reach operating temperature quickly, improving sensor response and reducing emissions during cold starts. The 32-inch wiring harness length offers flexibility during installation, while the four-wire design supports both the sensor signal and heater circuit. The threaded mounting type with an 18mm diameter ensures a secure and proper fit in the exhaust system of compatible Volvo models.

Common Applications and Issues Addressed

• Helps correct inaccurate air-fuel mixture readings
• Reduces engine misfires related to faulty oxygen sensors
• Improves fuel economy by optimizing combustion
• Prevents increased emissions and failed emissions tests
• Resolves check engine light triggers related to oxygen sensor faults

Installation Notes and Tips

When installing the NTK 25591 oxygen sensor, ensure the vehicle is cool to avoid burns. Use appropriate tools to remove the old sensor and avoid damaging the wiring harness. Verify the sensor’s connector matches the vehicle’s harness and confirm the threaded mounting fits securely. It is recommended to apply anti-seize compound on the threads to facilitate future removal.

Quality Assurance and Warranty

NTK oxygen sensors are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Direct Fit Oxygen Sensor 25591 undergoes rigorous testing to comply with OEM specifications. Please refer to NTK’s warranty policy for coverage details on this part.