Walker 350-34426 Oxygen Sensor - Upstream Left or Upstream Right

OE-Style Oxygen Sensor for Audi Applications

Walker Products 350-34426 is a heated oxygen sensor built as a specific-fit replacement for select Audi models. It is engineered for upstream right and upstream left positions on the Audi A8 Quattro and Audi S8, helping the ECU receive the exhaust feedback it needs for fuel control and emissions monitoring.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for OE-style replacement use. Part number 350-34426 is application-specific, with the correct connector style, thread size, and harness layout for the listed vehicles.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit for listed Audi A8 Quattro and Audi S8 applications
• Fits upstream right and upstream left sensor positions
• 4-wire design with 22-gauge wiring
• Radiused polygon male connector for vehicle-specific connection
• Threaded mounting with 18.0 mm thread diameter
• Overall length: 16.85 in.; wiring harness length: 13.31 in.

Detailed Description

Walker Products 350-34426 is an OE-replacement oxygen sensor for 2000-2003 Audi A8 Quattro and 2001-2003 Audi S8 models in upstream right and upstream left locations. As a heated sensor, it is built to provide the ECU with the exhaust-gas feedback needed for air-fuel management and emissions control. The specific-fit design helps ensure the connector, harness length, and threaded mounting match the listed application.

This part number is a practical choice when replacing a failed upstream oxygen sensor on an Audi A8 Quattro or Audi S8. Walker Products 350-34426 is designed around the vehicle application rather than a universal layout, which supports proper installation on the correct bank and position.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel correction
• Elevated exhaust emissions from a failing sensor
• Stored ECU fault codes tied to the oxygen sensor circuit

Installation Notes and Tips

Verify the vehicle position before installation: this part is listed for upstream right and upstream left locations only. Inspect the sensor wiring harness and connector for damage before replacement, since damaged wiring can shorten sensor life or affect signal quality. Confirm thread diameter, connector shape, and harness length against the original sensor before installation on the Audi A8 Quattro or Audi S8.

Quality Assurance

Walker Products manufactures engine management sensors as OE-style replacements for worldwide vehicle applications and operates as an ISO 9001/TS 16949 certified company. Part number 350-34426 is built for the specified fitment and diagnostic feedback requirements of the listed Audi applications.