Walker 350-34029 Oxygen Sensor - Downstream or Upstream

Walker 350-34029 Oxygen Sensor for Volkswagen and Audi

Walker Products 350-34029 is a heated, specific-fit oxygen sensor built for select Volkswagen and Audi applications. It is engineered as an OE-style replacement for upstream and downstream positions where accurate exhaust feedback is needed by the ECU.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fitment for the listed Volkswagen and Audi applications
• 4-wire design with 20-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for direct vehicle connection
• Wiring harness length: 42.44 in.; overall length: 45.98 in.

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen sensor replacement parts built for application-specific fitment. Part number 350-34029 is made for vehicles that require a direct replacement sensor with the correct connector style, harness length, and mounting configuration for proper ECU feedback. This sensor is listed for multiple Volkswagen Pointer, Pointer Truck, Cabrio, Jetta, Golf, and Passat applications, as well as 1997 Audi A4 and A4 Quattro upstream positions.

Fits 1998-2003 Volkswagen Pointer, upstream. Fits 1999-2003 Volkswagen Pointer Truck, upstream. Fits 1996-1999 Volkswagen Cabrio, upstream or downstream. Fits 1996-1999 Volkswagen Jetta, upstream or downstream. Fits 1996-1998 Volkswagen Golf, upstream or downstream. Fits 1996-1997 Volkswagen Passat, downstream. Fits 1997 Audi A4, upstream. Fits 1997 Audi A4 Quattro, upstream.

This part cross-references Bosch 15733 and Denso 234-4010 for the same application.

Common Issues This Sensor May Address

• Check engine light or malfunction indicator light related to oxygen sensor performance
• Poor engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust 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 both upstream and downstream applications depending on vehicle and engine configuration. Inspect the wiring harness and connector for heat damage, abrasion, or corrosion before replacement. Confirm thread diameter, connector shape, and harness length against the original sensor to ensure proper routing and fit.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an Automotive ISO 9001/TS 16949 certified company. Part number 350-34029 is built as an OE replacement sensor for the specified applications.