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NTK 25174 Oxygen Sensor - Downstream or Downstream Right
| Brand | NTK 25174 |
|---|---|
| Position | Downstream Right and Downstream |
| Wiring Harness Length | 38.2500 |
| 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 | Audi · 6 vehicles |
Direct fit design. Built for specific applications with OE-style fit, form, and function.
Heated sensor. Supports responsive exhaust feedback with a 4-wire configuration.
OE-tested quality. Extensively tested during manufacturing to meet or exceed OE specifications.
Cross-references BBB Industries 13944, 06E906265E and 75-3403 for the same application. See all 4.
Direct Fit Oxygen Sensor for Audi
The NTK 25174 is a direct fit oxygen sensor built for specific Audi applications that require a heated, threaded sensor with a 4-wire design. It is engineered for accurate exhaust monitoring and OE-style fit, form, and function.
- Specific-fit oxygen sensor for targeted applications
- Heated sensor design for responsive exhaust feedback
- 4-wire configuration for proper signal and heater circuit operation
- Threaded mounting type for direct replacement installation
- 38.2500 wiring harness length for application-specific routing
Fitment and Application Details
Fits 2010-2011 Audi A6, downstream. Fits 2009 Audi A6 Quattro, downstream right. Fits 2006 Audi A4, downstream right. Fits 2006 Audi A4 Quattro, downstream right. Fits 2005 Audi A4 Quattro, downstream right. This part cross-references BBB Industries 13944 and Interchanges 06E906265E for the same application.
NTK positions this oxygen sensor line as a direct fit solution backed by extensive manufacturing tests and OE application coverage. The 25174 is part of NTK's broader sensor program, which focuses on streamlined coverage for import and domestic vehicles while maintaining OE-level fit and function. For Audi A4 and Audi A6 applications, the 25174 supports accurate replacement when the original sensor has aged, failed, or triggered drivability concerns.
Common Replacement Reasons
- Check engine light related to oxygen sensor performance
- Incorrect air-fuel ratio readings
- Reduced fuel economy from a failing sensor
- Slow sensor response or heater circuit faults
- Emissions test failures tied to exhaust monitoring issues
Installation Notes
Verify the connector, harness length, thread diameter, and downstream position before installation. Confirm chassis breakpoints and engine-specific notes listed in the fitment data for Audi A4, Audi A4 Quattro, Audi A6, and Audi A6 Quattro applications. Use the vehicle's service information to match the sensor location and routing requirements.
Quality Assurance
NTK states that its oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications. The brand is part of the NGK family of products and is recognized as a major original equipment oxygen sensor supplier.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2011 | Audi | A6 | 3.2L | V6 | Downstream | Cyls. 1-3; B1S2; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2010 | Audi | A6 | 3.2L | V6 | Downstream | Cyls. 1-3; B1S2; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2009 | Audi | A6 Quattro | 3.0L | V6 | Downstream Right | B1S2 oxygen sensor meets OEM standards.; Direct Fit Oxygen Sensor |
| 2006 | Audi | A4 | 3.2L | V6 | Downstream Right | To Chassis # 8E-6-035 000; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2006 | Audi | A4 Quattro | 3.2L | V6 | Downstream Right | To Chassis # 8E-6-035 000; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2005 | Audi | A4 Quattro | 3.2L | V6 | Downstream Right | B1S2 oxygen sensor meets OEM standards.; Direct Fit Oxygen Sensor |
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