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Bosch 18108 Oxygen Sensor - Downstream or Downstream Left
| Brand | Bosch 18108 |
|---|---|
| Position | Downstream and Downstream Left |
| Wiring Harness Length | 42 |
| Terminal Type | Blade |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Grade Type | Standard replacement |
| Connector Shape | Oblong |
| Terminal Quantity | 4 |
| Connector Gender | Male |
| Terminal Gender | Male |
| Overall Length | 45.7 |
| Mounting Type | Threaded |
| Automotive Color / Finish | Steel |
| Automotive Item Weight (lbs) | 0.330693 lb |
| Heated (Oxygen Sensor) | Yes |
| Hex Size (Oxygen Sensor) | 22 mm |
| Housing Material | Metal |
| Length (Sealing Surface To End Of Connector) | 44.5 in |
| Mounting Bracket Included | No |
| Oxygen Sensor Type | Narrow-band heated |
| Sensor Type | Narrow-band |
| Thread Diameter (Oxygen Sensor) | 18 mm |
| Thread Size | 18 |
| Wiring Harness Included | Yes |
| Product line | Bosch Engineered Oxygen Sensor |
| Fits | Audi · 9 vehicles |
Standard replacement. Direct-fit oxygen sensor for straightforward replacement.
Heated narrow-band design. Helps deliver faster closed-loop operation and accurate air-fuel readings.
Bosch OE heritage. Built on decades of original-equipment sensor development.
Cross-references 4L0906262J and 06E906265D for the same application. See all 2.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Bosch Oxygen Sensor for Audi Fitment
Bosch Engineered Oxygen Sensor 18108 is a narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management in Audi applications that call for a specific-fit downstream sensor.
Key Features
- Bosch Engineered Oxygen Sensor line with OE-focused design and calibration
- Narrow-band heated oxygen sensor for faster closed-loop operation
- Specific fit with threaded mounting and 18 mm thread diameter
- 4-wire design with included wiring harness and oblong male connector
- Metal housing and high-temperature-resistant construction for demanding exhaust conditions
- 42 in wiring harness length and 44.5 in sealing-surface-to-connector length
- Cross-reference part numbers: 4L0906262J and 06E906265D
Detailed Description
Bosch part number 18108 is engineered as a standard replacement oxygen sensor for downstream applications on select Audi models. The Bosch Engineered Oxygen Sensor product line builds on Bosch OE development in oxygen sensing technology, using advanced ceramic elements and optimized heater control to improve response and maintain accurate lambda feedback across changing exhaust temperatures. For Audi A6, Audi A6 Quattro, and Audi Q7 applications, this sensor provides the signal the engine control unit uses to manage fuel delivery and emissions performance.
Compatible With 2011-2015 Audi Q7, Downstream Left; 2010-2011 Audi A6, Downstream; 2009 Audi A6 Quattro, Downstream; and 2005 Audi A6 Quattro, Downstream. Bosch 18108 is a direct-fit, threaded narrow-band oxygen sensor with a 22 mm hex size, 18 mm thread size, and male connector terminals for a secure electrical connection.
What It Helps Address
- Fault codes related to downstream oxygen sensor performance
- Unstable air-fuel ratio feedback to the ECU
- Delayed closed-loop operation after exhaust heat changes
- Emissions test failures tied to sensor response issues
- Rough combustion control caused by inaccurate O2 readings
Installation Notes and Tips
Verify the connector shape, wire count, and downstream position before installation. This Bosch oxygen sensor uses a threaded mounting style and includes the wiring harness, so match the harness routing and connector orientation to the original layout on the vehicle. Confirm the application against the listed Audi Q7, Audi A6, and Audi A6 Quattro fitment before replacement.
Quality Assurance
Bosch has more than five decades of OE oxygen sensor development behind this design, and the 18108 reflects that experience with materials selected for heat and vibration resistance. It is built as an OE-proven replacement for the specified Audi applications.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2015 | Audi | Q7 | 3.0L | V6 | Downstream Left | Bosch Engineered Oxygen Sensor |
| 2014 | Audi | Q7 | 3.0L | V6 | Downstream Left | Bosch Engineered Oxygen Sensor |
| 2013 | Audi | Q7 | 3.0L | V6 | Downstream Left | Bosch Engineered Oxygen Sensor |
| 2012 | Audi | Q7 | 3.0L | V6 | Downstream Left | Bosch Engineered Oxygen Sensor |
| 2011 | Audi | A6 | 3.2L | V6 | Downstream | Cylinder(s) 4, 5, and 6; Bosch Engineered Oxygen Sensor |
| 2011 | Audi | Q7 | 3.0L | V6 | Downstream Left | Bosch Engineered Oxygen Sensor |
| 2010 | Audi | A6 | 3.2L | V6 | Downstream | Cylinder(s) 4, 5, and 6; Bosch Engineered Oxygen Sensor |
| 2009 | Audi | A6 Quattro | 3.0L | V6 | Downstream | Cylinder(s) 4, 5, and 6; Bosch Engineered Oxygen Sensor |
| 2005 | Audi | A6 Quattro | 3.2L | V6 | Downstream | Cylinder(s) 4, 5, and 6; Bosch Engineered Oxygen Sensor |
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