Walker 350-35029 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker 350-35029 Oxygen Sensor for Audi

Walker Products 350-35029 is a heated oxygen sensor built as a direct-fit replacement for specific Audi applications. It is engineered for the correct mounting position and ECU feedback, helping maintain accurate air-fuel monitoring on supported vehicles.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• Specific-fit design for the listed Audi Q7 and Audi A8 Quattro applications
• 5-wire configuration with a 20-gauge harness
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for application-specific connection
• Wiring harness length: 72.36 in; overall length: 75.91 in

Walker Products Engine Management Line

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for OE-style replacement needs. The 350-35029 follows that product-line approach by matching the required fitment position and sensor feedback for the vehicle’s ECU, which is important on newer systems that monitor sensor performance and store fault codes when readings fall outside expected range.

Detailed Description

Walker Products 350-35029 oxygen sensor is designed for direct replacement in select Audi models, including the Audi Q7 and Audi A8 Quattro. This heated sensor is intended for upstream locations and is listed for upstream right, upstream left, and upstream positions depending on the application. For buyers searching for a 2007-2010 Audi Q7 upstream oxygen sensor or a 2005-2007 Audi A8 Quattro upstream sensor, this part number provides the specified fitment and connector style needed for proper installation and ECU communication.

This part cross-references no listed aftermarket part numbers for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect air-fuel feedback
• Rough engine operation from inaccurate sensor readings
• Higher exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU for sensor or related system issues

Installation Notes and Tips

• Verify the exact position before ordering: upstream right, upstream left, or upstream.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation.
• Confirm thread diameter and connector shape match the original sensor on the vehicle.
• Use the vehicle’s fault codes and service information to confirm the affected bank or cylinder group when applicable.

Quality Assurance

Walker Products has supplied engine management components since 1946 and operates with ISO 9001/TS 16949 certification. The 350-35029 is manufactured as an application-specific replacement sensor for the listed Audi fitments.

• Fits 2007-2010 Audi Q7, upstream right
• Fits 2007-2010 Audi Q7, upstream left
• Fits 2007 Audi A8 Quattro, upstream
• Fits 2005-2006 Audi A8 Quattro, upstream