Walker 350-34054 Oxygen Sensor - Downstream Left

Walker 350-34054 Oxygen Sensor for Porsche, Audi, Volkswagen

Walker Products 350-34054 is a heated oxygen sensor built as a specific-fit OE-style replacement for select Porsche Cayenne, Audi Q7, and Volkswagen Touareg applications. It is positioned for the downstream left location and is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Key Features

• Specific-fit heated oxygen sensor for targeted vehicle applications
• Downstream left position for bank 2 sensor 2 service on listed Porsche Cayenne coverage
• Threaded mounting design with 18.0 mm thread diameter
• 4-wire configuration with 22-gauge wiring
• Radiused polygon male connector for application-specific connection
• Wiring harness length: 49.72 in.; overall length: 53.27 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for OE replacement use. Part number 350-34054 is built for the specified fitment position and is intended to deliver the diagnostic feedback the ECU expects from the downstream oxygen sensor circuit. This makes it a direct choice for drivers servicing a Porsche Cayenne downstream left oxygen sensor, as well as select Audi Q7 and Volkswagen Touareg applications listed below.

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

Vehicle Fitment

• Fits 2015-2018 Porsche Cayenne, downstream left. Notes: Downstream left oxygen sensor for bank 2 sensor 2.
• Fits 2011-2014 Porsche Cayenne, downstream left. Notes: Downstream left oxygen sensor required.
• Fits 2007-2010 Audi Q7, downstream left. Notes: Downstream left oxygen sensor required.
• Fits 2007-2009 Volkswagen Touareg, downstream left. Notes: Downstream left oxygen sensor required.

What It Helps Address

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

Installation Notes

Confirm the downstream left location before installation and verify connector shape, wire count, and thread size against the original sensor. Inspect the sensor wiring harness and connector for damage, since physical wear can shorten service life and affect signal quality. On vehicles with stored fault codes, clear codes only after the repair is complete and the system has been checked for proper operation.

Quality Assurance

Walker Products manufactures engine management sensors as OE-replacement components and operates as an Automotive ISO9001/TS 16949 certified company. Since 1946, the brand has supplied oxygen and air-fuel sensor solutions for a wide range of vehicle applications.