NTK 25511 Oxygen Sensor - Upstream

Direct Fit Oxygen Sensor for Volvo

NTK 25511 is a direct fit heated oxygen sensor built for specific applications and engineered for OE-style fit, form, and function. It is a threaded sensor with a 3-wire design and a 65.75-inch harness length for the listed Volvo applications.

Key Features

• Direct fit design for specific applications
• Heated oxygen sensor construction
• 3-wire configuration
• Threaded mounting type
• 65.75-inch wiring harness length
• 18 mm thread diameter

Detailed Description

NTK 25511 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific replacement parts with OE-style dimensions and connector layout. NTK is known for oxygen sensor manufacturing and uses ceramic technology and extensive production testing to support consistent performance. This part number is listed for upstream positions on select Volvo 240, Volvo 740, Volvo 760, Volvo 780, Volvo 940, Volvo 960, Volvo 244, and Volvo 245 applications. This part cross-references Bosch 13119 and DENSO Auto Parts 234-3033 for the same application.

What It Is Used For

• Replacing a failed upstream oxygen sensor
• Restoring air-fuel ratio feedback to the engine control system
• Addressing sensor-related fault codes
• Correcting poor fuel control caused by aging sensor response
• Replacing a sensor with the wrong harness length or connector style

Installation Notes and Tips

Verify the vehicle year, model, and upstream sensor location before installation. Confirm the 3-wire heated sensor layout, threaded mounting style, and harness length match the original part. Review the fitment notes for Bank 1 Sensor 1 and emissions-system exceptions such as Regina engine control or federal emissions where listed.

Quality Assurance

NTK states that these oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications. The brand is part of the NGK family and supplies original equipment oxygen sensors globally.