Walker 350-34144 Oxygen Sensor

Walker 350-34144 Oxygen Sensor Overview

Walker Products 350-34144 is a heated oxygen sensor built as a specific-fit OE-style replacement for select Audi and Volkswagen applications. It is engineered to deliver the ECU feedback needed for proper fuel control and emissions monitoring on upstream positions.

For drivers diagnosing a check engine light, poor fuel economy, or rough running conditions, this Walker Products Aftermarket sensor provides a direct-fit solution for the affected exhaust location. It is listed for upstream front, upstream rear, upstream left, upstream right, and upstream positions across multiple Audi A4, A6, S4, S6, RS4, Allroad Quattro, and Volkswagen Passat applications.

Key Features

• Part number: 350-34144
• Heated oxygen sensor for upstream exhaust monitoring
• Specific fitment for confirmed Audi and Volkswagen applications
• 4-wire design with 22-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for vehicle-specific connection
• Wiring harness length: 21.97 in.
• Overall length: 25.51 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for application-specific replacement. The 350-34144 is manufactured for the correct fitment position and is intended to provide the diagnostic feedback the ECU expects from the upstream sensor circuit. This matters on vehicles such as the Audi A4, Audi A6 Quattro, and Volkswagen Passat, where accurate oxygen sensor input supports fuel trim control and emissions performance.

This part number 350-34144 is listed for 2000-2005 Volkswagen Passat, 2000-2004 Audi A6 Quattro, 2002-2003 Audi S6, 2002 Audi RS4, 2000-2002 Audi S4, 2000-2001 Audi A4, 2000-2001 Audi A4 Quattro, 2000-2001 Audi A6, 2001 Audi Allroad Quattro, and related upstream positions shown in the fitment data.

What This Oxygen Sensor Helps Address

• Check engine light related to upstream oxygen sensor faults
• Poor fuel economy caused by incorrect air-fuel feedback
• Rough engine operation from inaccurate exhaust oxygen readings
• Elevated exhaust emissions from a failing sensor circuit
• Stored ECU fault codes tied to the oxygen sensor or related wiring

Installation Notes

Confirm the exact upstream position before installation, since this part is listed for multiple left, right, front, and rear upstream applications. Inspect the sensor, wiring harness, and connector for physical damage before replacement, and verify the threaded mounting location and connector style match the vehicle.

For fitment-based searches, this part is commonly referenced for a 2000-2005 Volkswagen Passat upstream oxygen sensor, a 2000-2004 Audi A6 Quattro upstream sensor, and a 2000-2002 Audi S4 upstream oxygen sensor. It is also listed for Audi A4, A4 Quattro, A6, S6, RS4, and Allroad Quattro upstream positions.

Quality Assurance

Walker Products has manufactured engine management and fuel system components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-34144 is built as a specific replacement sensor for the listed applications and fitment positions.