NTK 25701 Oxygen Sensor

Direct-Fit Oxygen Sensor

NTK oxygen sensor 25701 is a direct-fit, threaded heated sensor built for specific applications with OE-style fit, form, and function. It uses a 4-wire design and a 21.75-inch harness length for a clean replacement on compatible import performance and passenger vehicles.

• Specific-fit oxygen sensor for direct replacement applications
• Heated design for faster sensor operation
• 4-wire configuration for proper signal control
• Threaded mounting with 18 mm thread diameter
• 21.75-inch wiring harness length

Fitment and Application

Compatible with 2004-2011 Saab 9-3, upstream. Compatible with 2010-2011 Saab 9-3X, upstream. Compatible with 2002-2005 Porsche 911, upstream right, upstream left, downstream right, and downstream left. Compatible with 2004-2005 Porsche Carrera GT, upstream right, upstream left, downstream right, and downstream left.

For Saab 9-3 and Porsche 911 applications, this sensor supports air/fuel ratio monitoring and exhaust feedback control at the specified sensor locations. Part number 25701 is a direct-fit replacement for vehicles that require the listed threaded, heated configuration. This part cross-references Bosch (e.g., 16433, 16623) for the same application.

What It Helps Address

• Check engine light from a failing oxygen sensor
• Incorrect air/fuel ratio feedback
• Poor fuel control caused by slow sensor response
• Exhaust emissions issues tied to sensor degradation
• Driveability problems related to inaccurate oxygen readings

Installation Notes and Quality

Verify the sensor location, thread size, wire count, and harness length before installation. Confirm the application matches the required upstream or downstream position and the correct bank/sensor designation for your vehicle. NTK tests these oxygen sensors during manufacturing to meet or exceed OE specifications, and the brand is recognized as a major original equipment oxygen sensor supplier.