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NTK 25531 Oxygen Sensor - Upstream
| Brand | NTK 25531 |
|---|---|
| Position | Upstream |
| Wiring Harness Length | 48.2500 |
| Sensor Type | Heated |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Thread Diameter | 18.000 |
| Mounting Type | Threaded |
| Product line | Direct Fit Oxygen Sensor |
| Fits | Peugeot · 3 vehicles |
Direct fit design. Application-specific replacement sensor for straightforward installation.
Heated sensor. Supports faster operating response for exhaust oxygen monitoring.
OE-focused engineering. Built by NTK, a major original equipment oxygen sensor supplier.
Cross-references Bosch 13078, 75-2791 and 213-552 for the same application. See all 8.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Direct Fit Oxygen Sensor for Peugeot 405
NTK Direct Fit Oxygen Sensor 25531 is a specific-fit heated oxygen sensor built for the Peugeot 405 upstream application. It uses a threaded mounting design and a 4-wire configuration to support accurate air-fuel ratio monitoring in the exhaust stream.
Key Features
- Heated oxygen sensor for faster operating response
- Specific-fit design for direct application matching
- Threaded mounting type for secure installation
- 4-wire construction for signal and heater circuit operation
- 48.2500 wiring harness length
- 18.000 thread diameter
Detailed Description
NTK 25531 is part of the Direct Fit Oxygen Sensor line, a product line focused on application-specific replacement sensors. NTK draws on its background as a major oxygen sensor manufacturer and OE supplier to deliver fit, form, and function that align with original equipment requirements. This sensor is engineered for the 1989-1991 Peugeot 405 upstream position, where it monitors exhaust oxygen content to help the engine control system maintain the proper air-fuel mixture. This part cross-references Bosch 13078 for the same application.
What It Is Used For
- Replacing a failed upstream oxygen sensor
- Restoring accurate air-fuel ratio feedback
- Addressing check engine light concerns tied to sensor performance
- Correcting drivability issues related to improper fuel control
- Supporting emissions system operation on the Peugeot 405
Installation Notes and Tips
Verify the threaded mounting style, wire count, and harness length before installation. Confirm the upstream location and OE-style application match the vehicle configuration. Use the part number 25531 to confirm the correct sensor before ordering or installation.
Quality Assurance
NTK tests oxygen sensors during manufacturing to help ensure quality and reliability that meet or exceed OE specifications. The 25531 is built with OE application technology and is backed by NTK's focus on original equipment sensor coverage.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1991 | Peugeot | 405 | 1.9L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 1990 | Peugeot | 405 | 1.9L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
| 1989 | Peugeot | 405 | 1.9L | L4 | Upstream | OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor |
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