NTK 25500 Oxygen Sensor - Upstream

Direct Fit Oxygen Sensor for Porsche

Restore accurate exhaust feedback with this NTK direct fit oxygen sensor, part number 25500. It is a specific-fit, threaded sensor built for upstream applications and uses a non-heated design with a 20-inch wiring harness.

Key Features

• Direct fit oxygen sensor for specific applications
• Non-heated sensor design with one-wire construction
• Threaded mounting with 18 mm thread diameter
• 20-inch wiring harness for proper routing
• NTK engineering backed by OE-level manufacturing standards

Detailed Description

NTK 25500 is a direct fit oxygen sensor engineered for import applications that require an upstream, threaded sensor. The part is built with a non-heated, single-wire design and a 20-inch harness to match the original configuration used on select Porsche 911, Porsche 924, and Porsche 928 models. As part of NTK's Direct Fit Oxygen Sensor line, it is designed to deliver the correct fit, form, and function expected in OE-style replacement service. This part cross-references BBB Industries 11047 for the same application.

NTK is known for oxygen sensor manufacturing and uses ceramic technology developed from raw material through finished product control. The 25500 is manufactured and tested to meet or exceed OE specifications, making it a practical replacement for aging sensors that can affect drivability and emissions performance on Porsche 911 and Porsche 928 applications.

What It Is Used For

• Replacing a worn or slow-responding upstream oxygen sensor
• Addressing check engine light concerns tied to sensor output
• Correcting fuel mixture feedback issues from an aging sensor
• Restoring emissions system monitoring on specific Porsche applications

Installation Notes and Tips

Verify the threaded mounting style, wire count, and harness length before installation. This sensor is application-specific, so confirm the vehicle year and model against the fitment list for Porsche 911, Porsche 924, and Porsche 928. Use the existing exhaust bung location and follow standard oxygen sensor service procedures for removal and installation.

Quality Assurance

NTK tests these oxygen sensors during manufacturing to help ensure quality and reliability that meet or exceed OE specifications. The brand is part of the NGK family and is recognized as a major original equipment oxygen sensor supplier.