NTK 25717 Oxygen Sensor - Downstream

Direct Fit Oxygen Sensor for Volvo Applications

NTK 25717 is a direct fit heated oxygen sensor built for specific downstream applications. It uses a threaded mounting design and a 4-wire configuration for a precise replacement on supported Volvo models.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit design for direct replacement
• Threaded mounting type for secure installation
• 4-wire construction for signal and heater circuit operation
• 49.25-inch wiring harness length
• 18 mm thread diameter

Detailed Description

NTK 25717 is engineered as a direct fit oxygen sensor for downstream use on select Volvo S60, S80, V70, XC70, and XC90 applications. The sensor is part of NTK's Direct Fit Oxygen Sensor line, which focuses on application-specific coverage and OE-style fit, form, and function. As an oxygen sensor for Volvo S60 and Volvo XC90 applications, it is built to match the original mounting style and electrical configuration required for the listed vehicles.

NTK is known for oxygen sensor manufacturing and uses ceramic technology developed from raw material through finished product. This part number, 25717, is extensively tested during manufacturing to meet or exceed OE specifications for quality and reliability. This part cross-references Bosch 16488 and DENSO Auto Parts 234-4864 for the same application.

What This Part Helps Address

• Faulty oxygen sensor readings that can trigger engine management concerns
• Slow sensor response from a worn heated sensor element
• Improper downstream exhaust monitoring on supported Volvo models
• Connector or harness mismatch when replacing a specific-fit sensor
• Installation issues caused by incorrect thread size or mounting style

Installation Notes and Tips

Verify the downstream location, thread diameter, wire count, and harness length before installation. Confirm the vehicle application against the fitment list for the correct Volvo S60, S80, V70, XC70, or XC90 model year. Use proper oxygen sensor service procedures to avoid damaging the sensor or exhaust threads.

Quality Assurance

NTK states that its oxygen sensors are tested during manufacturing to meet or exceed OE specifications. The brand is part of the NGK family of products and is recognized as a major original equipment oxygen sensor supplier.