Walker 350-34207 Oxygen Sensor

Walker 350-34207 Oxygen Sensor Overview

Walker Products 350-34207 is a heated oxygen sensor built as a specific-fit OE replacement for select Audi and Volkswagen applications. It is engineered to provide the ECU with the correct feedback for downstream and upstream monitoring, helping maintain proper fuel control and emissions system operation.

Walker Products Aftermarket focuses on application-specific engine management and oxygen/air-fuel sensors for exact vehicle fitment. This part number is matched to the required mounting position and connector style for the listed vehicles, including Audi A4, A4 Quattro, A6, A6 Quattro, TT, TT Quattro, A8 Quattro, S4, Allroad Quattro, and Volkswagen Jetta, EuroVan, and Clasico applications.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• Specific-fit design for the listed downstream and upstream positions
• 4-wire configuration with a radiused polygon male connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 72.36 in; overall length: 75.91 in
• Built for ECU feedback on emissions and fuel-trim monitoring

Detailed Description

The Walker 350-34207 oxygen sensor is designed for direct replacement in vehicles that require a heated, threaded sensor with the correct connector and harness layout. It is used in applications where the ECU relies on oxygen sensor input to monitor exhaust content and adjust engine management strategy. For fitment-based searches, this part is commonly selected for downstream oxygen sensor replacement on Audi A4 and Volkswagen Jetta models, as well as select upstream and downstream positions on Audi TT and TT Quattro applications.

When an oxygen sensor begins to fail, the vehicle may store fault codes, run rich or lean, increase fuel consumption, raise exhaust emissions, or illuminate the malfunction indicator light. Checking the sensor, wiring harness, and connector for damage is important before replacement. Walker Products Aftermarket builds this sensor as an OE-style replacement for the specified application and position.

What This Oxygen Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough running or inconsistent air-fuel control
• Elevated exhaust emissions from a failing sensor
• Stored ECU fault codes tied to upstream or downstream sensor circuits

Installation Notes and Fitment Tips

• Fits 2011-2012 Volkswagen Clasico, downstream.
• Fits 2010 Volkswagen Jetta, downstream.
• Fits 2008-2009 Audi A8 Quattro, downstream.
• Fits 2004-2009 Audi S4, downstream right and downstream left.
• Fits 2000-2006 Audi A4, downstream; fits 2000-2001 Audi A4, upstream.
• Fits 2001-2006 Audi TT, downstream; fits 2000-2001 Audi TT, upstream.
• Fits 2002-2005 Audi Allroad Quattro, downstream right and downstream left.
• Fits 2001-2002 Volkswagen EuroVan, downstream.

Confirm the sensor position before ordering, since this part is listed for multiple upstream and downstream applications. Match the connector shape, wire count, and threaded mounting style to the original sensor on the vehicle. For Audi A4 downstream oxygen sensor replacement or Volkswagen Jetta downstream oxygen sensor service, verify the exact engine and VIN notes shown in the fitment data.

Quality Assurance

Walker Products has produced engine management and oxygen sensor components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-34207 reflects that application-specific approach with fitment matched to the listed vehicle positions and ECU feedback requirements.