Walker 350-34120 Oxygen Sensor - Downstream Right

Walker 350-34120 Oxygen Sensor for Audi A4 and A6

Walker 350-34120 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select Audi applications. It is built for the downstream right position and uses a 4-wire, threaded design with a male radiused polygon connector for direct replacement service.

Key Features

• Specific-fit oxygen sensor for confirmed Audi applications
• Heated sensor design for faster operating response
• Downstream right placement for the listed vehicles
• 4-wire configuration with 20-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 36.93 in.; overall length: 40.47 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for OE replacement use. The 350-34120 is manufactured for the specified application and fitment position so the ECU receives the expected diagnostic feedback. For Audi A4, Audi A4 Quattro, Audi A6, and Audi A6 Quattro models, this downstream right oxygen sensor is intended to restore proper sensor input when the original unit has aged or failed. This part number is Walker 350-34120.

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

What It Is Used For

• Replacing a failed downstream oxygen sensor on Audi A4 and A6 models
• Addressing check engine light concerns tied to oxygen sensor faults
• Correcting poor fuel economy caused by inaccurate exhaust feedback
• Helping reduce elevated exhaust emissions from a worn sensor
• Restoring ECU feedback on the downstream right sensor circuit

Installation Notes and Tips

Install Walker 350-34120 in the downstream right sensor location only for the listed Audi applications. Before replacement, inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten sensor life and affect operation. Verify the threaded mounting point and connector orientation match the original part before installation.

Quality Assurance

Walker Products has manufactured engine management components since 1946 and operates as an Automotive ISO 9001 / TS 16949 certified company. The Walker Products Aftermarket line is built around application-specific replacement parts for modern vehicle electronics and emissions systems.