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NTK 25083 Oxygen Sensor - Downstream or Downstream Right
| Brand | NTK 25083 |
|---|---|
| Position | Downstream Right |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 18.000 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 28.5000 |
| Product line | Direct Fit Oxygen Sensor |
| Fits | Audi · 18 vehicles |
Direct fit replacement. Specific-fit oxygen sensor for straightforward installation.
Heated sensor. Helps the sensor reach operating temperature quickly.
Threaded mounting. Installs with a secure, threaded connection.
Cross-references Bosch 15157, DENSO Auto Parts 234-4414 and 06E906265P for the same application. See all 4.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Direct Fit Oxygen Sensor for Audi Applications
The NTK Direct Fit Oxygen Sensor, part number 25083, is a heated, specific-fit replacement built for downstream monitoring on select Audi models. It is engineered for the Audi A4, A4 Quattro, A6, and A6 Quattro applications listed below, with OE-style fit, form, and function.
Key Features
- Heated oxygen sensor for faster operating response
- Specific-fit design for direct replacement installation
- 4-wire configuration with a 28.5 in. wiring harness
- 18 mm thread diameter and threaded mounting type
- Built for downstream right and downstream positions where listed
- NTK part number 25083
Product Details
NTK is the Sensor Specialist for import and domestic vehicles, and the Direct Fit Oxygen Sensor line is focused on OE application coverage and streamlined replacement selection. Part number 25083 is manufactured with ceramic sensor technology and tested during production to help maintain quality and reliability that meets or exceeds OE specifications. For Audi A4, Audi A4 Quattro, Audi A6, and Audi A6 Quattro service, this sensor supports accurate exhaust monitoring in the downstream location specified by the vehicle application.
This part cross-references Bosch 15157 and DENSO Auto Parts 234-4414 for the same application.
What It Helps Address
- Check engine light related to oxygen sensor performance
- Fault codes tied to downstream oxygen sensor readings
- Incorrect air-fuel feedback from a worn sensor
- Slow sensor response after extended service life
- Emissions inspection failures caused by sensor degradation
Installation Notes and Tips
- Verify the exact position before ordering; this listing covers downstream right and downstream applications shown in the fitment data.
- Confirm connector style, harness routing, and thread size against the original sensor.
- Inspect the exhaust bung and wiring path before installation to avoid cross-threading or harness strain.
- Clear diagnostic trouble codes after installation and confirm proper sensor operation with a scan tool.
Quality Assurance
NTK manufactures oxygen sensors with OE-focused engineering and extensive production testing to support consistent performance and reliability. The brand’s OE supply background and ceramic sensor expertise are central to the Direct Fit Oxygen Sensor line, including part number 25083.
- Fits 2009-2011 Audi A6 Quattro, Downstream Right
- Fits 2009 Audi A4 Quattro, Downstream Right
- Fits 2006-2009 Audi A6, Downstream
- Fits 2007-2008 Audi A4, Downstream Right
- Fits 2007-2008 Audi A4 Quattro, Downstream Right
- Fits 2005-2008 Audi A6 Quattro, Downstream
- Fits 2006 Audi A4, Downstream Right
- Fits 2006 Audi A4 Quattro, Downstream Right
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2011 | Audi | A6 Quattro | 3.0L | V6 | Downstream Right | B1S2 oxygen sensor meets OEM standards.; Direct Fit Oxygen Sensor |
| 2010 | Audi | A6 Quattro | 3.0L | V6 | Downstream Right | B1S2 oxygen sensor meets OEM standards.; Direct Fit Oxygen Sensor |
| 2009 | Audi | A4 Quattro | 3.2L | V6 | Downstream Right | OE MFR: NTK - Oxygen Sensor for Original Equipment Manufacturer.; Direct Fit Oxygen Sensor |
| 2009 | 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 |
| 2008 | Audi | A4 | 3.2L | V6 | Downstream Right | B1S2 oxygen sensor meets OEM standards.; Direct Fit Oxygen Sensor |
| 2008 | Audi | A4 Quattro | 3.2L | V6 | Downstream Right | B1S2 oxygen sensor meets OEM standards.; Direct Fit Oxygen Sensor |
| 2008 | Audi | A6 | 3.2L | V6 | Downstream | Cyls. 1-3; B1S2; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2008 | Audi | A6 Quattro | 3.2L | V6 | Downstream | Cyls. 1-3; B1S2; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2007 | Audi | A4 | 3.2L | V6 | Downstream Right | B1S2 oxygen sensor meets OEM standards.; Direct Fit Oxygen Sensor |
| 2007 | Audi | A4 Quattro | 3.2L | V6 | Downstream Right | B1S2 oxygen sensor meets OEM standards.; Direct Fit Oxygen Sensor |
| 2007 | Audi | A6 | 3.2L | V6 | Downstream | Cyls. 1-3; B1S2; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2007 | Audi | A6 Quattro | 3.2L | V6 | Downstream | Cyls. 1-3; B1S2; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2006 | Audi | A4 | 3.2L | V6 | Downstream Right | From Chassis # 8E-6-035 001; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2006 | Audi | A4 Quattro | 3.2L | V6 | Downstream Right | From Chassis # 8E-6-035 001; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2006 | Audi | A6 | 3.2L | V6 | Downstream | Cyls. 1-3; B1S2; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2006 | Audi | A6 Quattro | 3.2L | V6 | Downstream | Cyls. 1-3; B1S2; OE MFR: NTK; Direct Fit Oxygen Sensor |
| 2005 | Audi | A6 Quattro | 3.2L | V6 | Downstream | Cyls. 1-3; B1S2; OE MFR: NTK; Direct Fit Oxygen Sensor |
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