Walker 350-35056 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker 350-35056 Oxygen Sensor Overview

Walker Products 350-35056 is a heated oxygen sensor built as an OE-style replacement for specific Audi applications. It is engineered for upstream right, upstream left, and upstream positions where listed, helping the ECU receive the exhaust feedback it needs for proper fuel control and emissions monitoring.

For Audi R8, Audi A6 Quattro, Audi A8 Quattro, and Audi RS4 applications, this sensor is matched to the listed fitment position and connector style for direct replacement service.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed Audi applications
• 5-wire configuration with a radiused polygon male connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 64.49 in.; overall length: 68.03 in.
• Walker Products Aftermarket part number 350-35056

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for OE replacement use. Part number 350-35056 is manufactured for the specified application and fitment position so the vehicle’s diagnostic system can receive the correct feedback required by the ECU. This matters on newer vehicles that store fault codes when an oxygen sensor or related circuit begins to fail. In Audi R8, Audi A6 Quattro, Audi A8 Quattro, and Audi RS4 models, a worn sensor can contribute to poor engine performance, higher fuel use, increased exhaust emissions, and a malfunction indicator light.

This part cross-references no listed alternate part numbers in the provided data.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture concerns
• Reduced fuel economy from inaccurate exhaust feedback
• Higher exhaust emissions during operation
• Poor drivability caused by a failing upstream sensor

Installation Notes

Verify the exact position before installation: upstream right, upstream left, or upstream as listed for the vehicle. Confirm the 5-wire connector, 18.0 mm thread diameter, and harness routing match the original sensor. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement, since physical damage can shorten service life and affect ECU feedback.

Fits 2015 Audi R8, upstream right; 2014 Audi R8, upstream right; 2008-2012 Audi R8, upstream left; 2005-2011 Audi A6 Quattro, upstream right; 2005-2011 Audi A6 Quattro, upstream left; 2007-2010 Audi A8 Quattro, upstream left; 2007-2008 Audi RS4, upstream right; 2007-2008 Audi RS4, upstream left; 2007 Audi A8 Quattro, upstream.

Quality Assurance

Walker Products states that its engine management and oxygen/air-fuel sensors are developed as original equipment replacement parts and that the company is ISO 9001 / TS 16949 certified. Part number 350-35056 is built for the specified application and fitment position to support proper diagnostic feedback in the vehicle’s ECU.