Walker 350-35035 Oxygen Sensor - Downstream, Upstream, Upstream Front or Upstream Left

Walker Oxygen Sensor for OE-Style Engine Management

Walker Products Part Number 350-35035 is a heated oxygen sensor built as a specific-fit OE replacement for select Volkswagen, Audi, Porsche, Bentley, and EuroVan applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper air-fuel control on upstream and downstream positions where listed.

Key Features

• Heated oxygen sensor design for faster operating temperature
• Specific fitment for the listed vehicle applications and sensor positions
• 5-wire configuration with a 20-gauge harness
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for application-specific connection
• Overall length: 60.16 in; wiring harness length: 56.61 in

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered as OE replacements for worldwide vehicle coverage. Part number 350-35035 is built for the specified application and position so the ECU receives the correct sensor feedback. For vehicles such as the Audi A4, Audi TT, Volkswagen Touareg, and Volkswagen GLI, accurate oxygen sensor operation is important for fuel control, emissions monitoring, and fault-code management.

This part cross-references no listed interchange numbers in the provided data. Search phrase examples include Walker 350-35035 oxygen sensor for 2001-2006 Audi A4 upstream, 2004-2009 Volkswagen Touareg upstream left, and 2010 Volkswagen GLI upstream.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine running caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel readings
• Higher exhaust emissions from a failing sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Verify the sensor position before installation, since this part is listed for upstream, upstream left, downstream, and upstream front applications depending on vehicle. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement. Confirm thread size, connector shape, and harness length against the original sensor to ensure proper routing and fit.

Quality Assurance

Walker Products states that its engine management sensors are developed for OE-style replacement use and manufactured under ISO 9001 / TS 16949 quality systems. Since 1946, the brand has supplied oxygen and air-fuel sensors for a wide range of vehicle applications.

Compatible Vehicles

• Fits 2010 Volkswagen GLI, upstream
• Fits 2007-2010 Volkswagen Golf City, upstream
• Fits 2008-2009 Volkswagen Jetta City, upstream
• Fits 2004-2009 Volkswagen Touareg, upstream left
• Fits 2007-2008 Audi A4, upstream
• Fits 2007 Volkswagen Beetle, downstream
• Fits 2001-2006 Audi A4, upstream
• Fits 2004-2006 Audi A8 Quattro, upstream left
• Fits 2001-2006 Audi TT, upstream
• Fits 2004-2006 Audi TT Quattro, upstream left
• Fits 2003-2006 Porsche Cayenne, upstream left
• Fits 2001-2005 Audi A4 Quattro, upstream
• Fits 2004 Volkswagen R32, upstream front
• Fits 2003 Bentley Continental, upstream left
• Fits 2003 Volkswagen R32, upstream left
• Fits 2001-2002 Audi TT Quattro, upstream
• Fits 2001-2002 Volkswagen EuroVan, upstream