NTK 25705 Oxygen Sensor - Downstream, Downstream Right or Upstream

Direct-fit oxygen sensor

NTK Oxygen Sensor 25705 is a specific-fit, heated oxygen sensor built for emission control applications that require accurate air-fuel feedback. It uses a threaded mounting design and a 4-wire configuration with a 48.2500 harness length for direct replacement service.

Compatible With select Bentley, Volkswagen, and Audi applications, this NTK oxygen sensor is part of the Direct Fit Oxygen Sensor line. The design focuses on OE-style fit, form, and function for straightforward replacement on supported vehicles.

Key features

• Heated oxygen sensor design for faster operating response.
• Specific-fit configuration for direct replacement service.
• Threaded mounting type for application-matched installation.
• 4-wire layout with 48.2500 harness length.
• OE-equivalent design language used across supported applications.

Detailed description

Part number 25705 is an NTK oxygen sensor engineered for direct-fit replacement where the original sensor uses a threaded, heated, 4-wire design. Fitment includes 2015 Bentley Continental, downstream; 2004-2007 Volkswagen Touareg, downstream right; 2004-2005 Volkswagen Jetta, upstream; 2000-2002 Volkswagen Cabrio, upstream; 2000 Audi A4, upstream; 2000 Audi A4 Quattro, upstream; and 2000 Volkswagen Passat, upstream. Notes in the fitment data identify Bank 1 Sensor 1 applications on several Volkswagen and Audi models.

NTK is known for oxygen sensor manufacturing and OE application coverage. The 25705 follows the brand's direct-fit approach, making it a practical replacement for vehicles that need the same sensor style, connector layout, and mounting method as the original part. This part cross-references DENSO Auto Parts (e.g., 234-4874) for the same application.

What it is used for

• Replacing a failed heated oxygen sensor.
• Restoring air-fuel ratio feedback to the engine control system.
• Addressing check engine light concerns tied to oxygen sensor faults.
• Correcting drivability issues related to inaccurate exhaust oxygen readings.
• Replacing a sensor with the same threaded, direct-fit configuration.

Installation notes and tips

Verify the year, make, model, and position against the fitment table before ordering. Match the upstream or downstream location exactly, since the application notes vary by vehicle. Confirm the connector style, wire count, and harness length against the original sensor before installation.

Quality assurance

NTK states that its oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications. The brand also positions this line as an OE-style direct-fit solution backed by its oxygen sensor manufacturing experience.