/live/media/NO/NO_25642_Fro.jpg)
Will it fit your vehicle?
Confirm before you buy. Free return shipping if it doesn't fit.
NTK 25642 Oxygen Sensor
| Brand | NTK 25642 |
|---|---|
| Position | Upstream Right, Upstream Left, Downstream Right, and Downstream Left |
| Wiring Harness Length | 48.5000 |
| 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 · 10 vehicles |
Direct fit design. Application-specific replacement for streamlined service and OE-style fit.
Heated 4-wire sensor. Built for faster response and stable signal performance.
OE-tested quality. Manufactured and tested to meet or exceed OE specifications.
Cross-references Bosch 13396, OSC 13414 and 213-2950 for the same application. See all 7.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Direct Fit Oxygen Sensor
NTK 25642 is a direct-fit heated oxygen sensor built for specific Audi applications. It uses a threaded mounting design and a 4-wire harness to match the original sensor layout for accurate replacement service.
Key Features
- Heated oxygen sensor for faster operating response
- Specific-fit design for direct replacement service
- Threaded mounting type for secure installation
- 4-wire configuration with 48.5-inch harness length
- 18 mm thread diameter
Detailed Description
NTK 25642 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific replacement parts rather than universal coverage. NTK is known for oxygen sensor manufacturing and uses ceramic technology control from raw material through finished product. This sensor is manufactured and tested to meet or exceed OE specifications, with fit, form, and function aligned to original equipment requirements. It is a direct replacement for select Audi A6 and Audi 100 applications, including Audi A6 downstream left and right positions and Audi 100 and Audi 100 Quattro upstream left and right positions. This part cross-references Bosch 13396 and OSC 13414 for the same application.
What It Is Used For
- Replacing a failed heated oxygen sensor
- Restoring exhaust gas feedback to the engine control system
- Addressing sensor-related fault codes
- Correcting drivability issues tied to oxygen sensor signal loss
- Servicing OE-style emissions control systems on Audi vehicles
Installation Notes and Tips
Verify the exact vehicle, model year, and sensor position before ordering. Match the threaded mounting style, wire count, and harness length to the original part. Use the fitment notes for serial and chassis breakpoints on 1994 and 1998 applications. Professional installation is recommended for proper sensor routing and secure thread engagement.
Quality Assurance
NTK states that these oxygen sensors are extensively tested during manufacturing to support quality and reliability that meet or exceed OE specifications. The brand is part of the NGK family of products and supplies original equipment oxygen sensors globally.
| Year | Make | Model | Drive Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 1998 | Audi | A6 | FWD | 2.8L | V6 | Downstream Right | To Serial # 4A-W-005 000; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 1998 | Audi | A6 | FWD | 2.8L | V6 | Downstream Left | To Serial # 4A-W-005 000; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 1997 | Audi | A6 | FWD | 2.8L | V6 | Downstream Right | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 1997 | Audi | A6 | FWD | 2.8L | V6 | Downstream Left | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 1996 | Audi | A6 | FWD | 2.8L | V6 | Downstream Right | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 1996 | Audi | A6 | FWD | 2.8L | V6 | Downstream Left | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 1994 | Audi | 100 | — | 2.8L | V6 | Upstream Right | From Chassis # 4A-R-062 001; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 1994 | Audi | 100 | — | 2.8L | V6 | Upstream Left | From Chassis # 4A-R-062 001; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 1994 | Audi | 100 Quattro | — | 2.8L | V6 | Upstream Right | From Chassis # 4A-R-062 001; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 1994 | Audi | 100 Quattro | — | 2.8L | V6 | Upstream Left | From Chassis # 4A-R-062 001; OE Equivalent Design; Direct Fit Oxygen Sensor |
| No rows match your filter. | |||||||