NTK 25576 Oxygen Sensor - Upstream

Direct Fit Oxygen Sensor

This NTK oxygen sensor is a specific-fit, heated replacement built for precise air-fuel monitoring. It uses a threaded mounting design and a 3-wire configuration with a 26.75-inch harness for a direct-fit installation path.

Key Features

• Heated oxygen sensor for faster operating response.
• Specific-fit design for direct replacement applications.
• Threaded mounting type with 18 mm thread diameter.
• 26.75-inch wiring harness for application-specific routing.
• 3-wire construction for controlled signal output.

Detailed Description

NTK 25576 is part of the Direct Fit Oxygen Sensor line, engineered for import and domestic applications where OE-style fit, form, and function matter. As an oxygen sensor for Volkswagen Transporter and Volkswagen Vanagon applications, it is built to match the original installation style and support accurate exhaust feedback for the engine management system. NTK 25576 reflects the brand's focus on sensor technology and application coverage, with manufacturing controls intended to meet or exceed OE specifications.

This part cross-references Delphi ES10261 and DENSO Auto Parts 234-3028 for the same application.

What It Is Used For

• Replacing a worn oxygen sensor that can trigger drivability concerns.
• Restoring proper air-fuel ratio feedback to the engine control system.
• Addressing sensor response issues caused by age or contamination.
• Correcting exhaust monitoring faults tied to upstream sensor performance.

Installation Notes and Tips

Fits 1986-1991 Volkswagen Transporter, Upstream. Fits 1986-1991 Volkswagen Vanagon, Upstream. Confirm the threaded mounting style, wire count, and harness length before installation. Use the vehicle's original sensor location and note that the fitment is specific, not universal.

Quality Assurance

NTK is part of the NGK family of products and is a major original equipment oxygen sensor supplier. Each sensor is extensively tested during manufacturing to support quality and reliability that meets or exceeds OE specifications.