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NTK 25743 Oxygen Sensor - Downstream
| Brand | NTK 25743 |
|---|---|
| Position | Downstream |
| Wiring Harness Length | 26.7500 |
| 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 | BMW · 13 vehicles |
Direct-fit design. Application-specific replacement for straightforward sensor service.
Heated sensor. Helps the sensor reach operating temperature quickly for stable feedback.
OE-style coverage. NTK 25743 is backed by extensive manufacturing tests for reliability.
Cross-references 11787848486 for the same application. See all 1.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Direct-Fit Oxygen Sensor
NTK Oxygen Sensor 25743 is a direct-fit, heated oxygen sensor built for specific downstream applications. It is engineered for precise fit, stable signal performance, and OE-style replacement on BMW M2, BMW M4, and BMW M3 applications.
Key Features
- Direct-fit design for specific applications
- Heated oxygen sensor for faster operating response
- 4-wire configuration with threaded mounting
- 26.75-inch wiring harness length
- 18 mm thread diameter
- NTK 25743 part number for easy identification
Detailed Description
NTK 25743 is part of the Direct Fit Oxygen Sensor line, a product family focused on application-specific replacement and OE-style coverage. Built by NTK, a major original equipment oxygen sensor supplier, this sensor uses ceramic-based manufacturing expertise and extensive production testing to support fit, form, and function. It is a threaded, heated sensor with a specific fit design, making it a practical replacement for downstream oxygen sensor service on BMW M2, BMW M4, and BMW M3 models listed in the fitment data. This part cross-references BMW 11787848486 for the same application.
What It Is Used For
- Replacing a failed downstream oxygen sensor
- Restoring proper exhaust gas feedback to the engine management system
- Addressing check engine light concerns related to oxygen sensor performance
- Correcting drivability issues caused by inaccurate air-fuel monitoring
- Servicing OE-equivalent sensor applications on BMW M2, BMW M4, and BMW M3
Installation Notes and Tips
Verify the downstream location, connector style, thread diameter, and harness length before installation. Use the fitment notes to confirm the correct BMW M2, BMW M4, or BMW M3 application, and compare the original sensor to the replacement part number 25743 before installation.
Quality Assurance
NTK tests oxygen sensors during manufacturing to support quality and reliability that meet or exceed OE specifications. The brand’s OE-supplier background and application-specific design support consistent replacement performance.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2021 | BMW | M2 | 3.0L | L6 | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2020 | BMW | M2 | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2020 | BMW | M4 | 3.0L | L6 | Downstream | OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2019 | BMW | M2 | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2019 | BMW | M4 | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2018 | BMW | M3 | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2018 | BMW | M4 | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2017 | BMW | M3 | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2017 | BMW | M4 | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2016 | BMW | M3 | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2016 | BMW | M4 | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2015 | BMW | M3 | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2015 | BMW | M4 | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
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