Walker 350-34427 Oxygen Sensor

Walker 350-34427 Oxygen Sensor Overview

Walker Products 350-34427 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 exhaust feedback for fuel control and emissions monitoring, making it a direct replacement choice for downstream and upstream sensor locations on listed vehicles.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for precise application fitment. The 350-34427 follows that approach with a threaded, 4-wire heated design, a 18.0 mm thread diameter, and a radiused polygon male connector for proper vehicle-side connection.

Key Features

• Heated oxygen sensor for ECU feedback and emissions control
• Specific-fit design for listed Audi and Volkswagen models
• 4-wire configuration with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 26.69
• Overall length: 30.24
• Radiused polygon male connector for application-specific fitment

Detailed Description

The Walker 350-34427 oxygen sensor is made for vehicles that require accurate exhaust-gas monitoring at the upstream or downstream position, depending on the application. It supports the engine control unit by reporting air-fuel information needed for mixture correction, catalyst monitoring, and fault-code detection. This part number is listed across multiple Volkswagen Pointer, Pointer Truck, EuroVan, Passat, Jetta, and Golf applications, as well as Audi A4, A4 Quattro, A6, A6 Quattro, A8, and A8 Quattro models.

For shoppers searching long-tail terms such as downstream oxygen sensor for Volkswagen Pointer Truck, upstream oxygen sensor for Audi A4 Quattro, or heated oxygen sensor for Volkswagen Passat, Walker 350-34427 matches the specified vehicle position and connector style. This part cross-references Bosch 15733 and Denso 234-4018 for the same application.

What It Helps Address

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

Installation Notes and Tips

Confirm the exact position before ordering, since this part is listed for downstream, upstream, upstream front, upstream rear, upstream left, and upstream right applications depending on the vehicle. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear before installation. Verify thread size, connector shape, and harness routing against the original sensor to ensure proper fit on the Audi A4, Audi A6, Volkswagen Passat, and related applications.

Quality Assurance

Walker Products has manufactured engine management components since 1946 and operates as an ISO 9001/TS 16949 certified company. The 350-34427 is built as an OE-style replacement sensor for the listed applications and is backed by Walker Products’ manufacturing standards.

Compatible Vehicles

• Fits 1999-2010 Volkswagen Pointer Truck, downstream
• Fits 1998-2009 Volkswagen Pointer, downstream
• Fits 1997-2000 Audi A4 Quattro, downstream
• Fits 1999-2000 Volkswagen EuroVan, upstream
• Fits 1997 Volkswagen EuroVan, upstream
• Fits 1998-2000 Volkswagen Passat, upstream rear
• Fits 1998-2000 Volkswagen Passat, upstream front
• Fits 1997-1999 Audi A4, upstream right
• Fits 1997-1999 Audi A4, upstream left
• Fits 1997-1999 Audi A4, downstream
• Fits 1998-1999 Audi A4 Quattro, upstream right
• Fits 1998-1999 Audi A4 Quattro, upstream left
• Fits 1998-1999 Audi A6, upstream right
• Fits 1998-1999 Audi A6, upstream left
• Fits 1998-1999 Audi A6 Quattro, upstream right
• Fits 1998-1999 Audi A6 Quattro, upstream left
• Fits 1997-1999 Audi A8, upstream right
• Fits 1997-1999 Audi A8, upstream left
• Fits 1997-1999 Audi A8 Quattro, upstream right
• Fits 1997-1999 Audi A8 Quattro, upstream left
• Fits 1995-1999 Volkswagen Jetta, upstream
• Fits 1998-1999 Volkswagen Passat, downstream
• Fits 1995-1998 Volkswagen Golf, upstream
• Fits 1996-1997 Volkswagen Passat, upstream
• Fits 1996 Volkswagen Passat, upstream