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NTK 25506 Oxygen Sensor - Upstream
| Brand | NTK 25506 |
|---|---|
| Position | Upstream |
| Wiring Harness Length | 21.7500 |
| Sensor Type | Heated |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 3 |
| Thread Diameter | 18.000 |
| Mounting Type | Threaded |
| Product line | Direct Fit Oxygen Sensor |
| Fits | Porsche · 7 vehicles |
Direct fit design. Built for specific applications with OE-style replacement geometry.
Heated sensor. Helps the sensor reach operating temperature faster for responsive feedback.
Threaded mounting. Uses an 18 mm thread diameter and 3-wire configuration.
Cross-references BBB Industries 13918, Carlson 13003 and Davico Mfg 13018 for the same application. See all 14.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Direct Fit Oxygen Sensor
NTK 25506 is a direct fit heated oxygen sensor built for specific applications with threaded mounting and a 3-wire design. It is engineered for accurate air-fuel ratio feedback and OE-style fitment on select Porsche applications.
- Heated oxygen sensor for faster operating response
- Specific-fit design for direct replacement applications
- Threaded mounting with 18 mm thread diameter
- 21.75-inch wiring harness length for application-specific routing
- 3-wire configuration for controlled signal output
Fitment Details
Compatible with select Porsche applications. Fits 1986-1987 Porsche 928, upstream. Fits 1984-1985 Porsche 911, upstream. Fits 1983-1985 Porsche 928, upstream. This part cross-references BBB Industries 13918 and Carlson 13003 for the same application.
NTK 25506 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific coverage and OE-style replacement geometry. NTK draws on its role as a major oxygen sensor manufacturer to deliver fit, form, and function aligned with original equipment expectations.
What It Helps Address
- Faulty oxygen sensor readings
- Delayed closed-loop fuel control
- Check engine light concerns related to sensor performance
- Rough air-fuel ratio correction
Installation Notes and Tips
Use the threaded mounting design and harness length to match the original routing before installation. Verify the upstream location, thread size, and wire count against the removed sensor to confirm correct application for Porsche 928 and Porsche 911 fitment. Because this is a specific-fit sensor, confirm connector and mounting details before 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 for original equipment oxygen sensor production.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1987 | Porsche | 928 | 5.0L | V8 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 1986 | Porsche | 928 | 5.0L | V8 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 1985 | Porsche | 911 | 3.2L | H6 | Upstream | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 1985 | Porsche | 928 | 5.0L | V8 | Upstream | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 1984 | Porsche | 911 | 3.2L | H6 | Upstream | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 1984 | Porsche | 928 | 4.7L | V8 | Upstream | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 1983 | Porsche | 928 | 4.7L | V8 | Upstream | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
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