Walker 350-34740 Oxygen Sensor - Downstream Left

Walker 350-34740 Oxygen Sensor Overview

Walker Products 350-34740 is a heated oxygen sensor built as a specific-fit OE replacement for select Audi applications. It is engineered to deliver the correct ECU feedback for the assigned mounting position, helping maintain accurate air-fuel control and emissions monitoring.

Compatible With 2015-2017 Audi A8 Quattro, downstream left, and 2008-2009 Audi A3, upstream. The Walker Products Aftermarket line focuses on application-specific engine management and oxygen/air-fuel sensors for direct replacement use.

Key Features

• Part number: 350-34740
• Heated oxygen sensor design
• Specific fit for the listed Audi applications
• Threaded mounting type with 18.0 mm thread diameter
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector
• Wiring harness length: 13.38 in.
• Overall length: 16.73 in.

Detailed Description

Walker Products 350-34740 is engineered for the exact sensor location required by the vehicle, including downstream left bank 2 sensor 2 service on the 2015-2017 Audi A8 Quattro and upstream service on the 2008-2009 Audi A3. As an oxygen sensor, it provides the ECU with the feedback needed to monitor exhaust oxygen content and support proper fuel control and emissions system operation. Walker Products Aftermarket parts are developed as OE-style replacements for worldwide vehicle coverage, with application-specific fitment and connector design.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues This Sensor May Address

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

Installation Notes and Tips

Verify the sensor position before installation: downstream left bank 2 sensor 2 on the Audi A8 Quattro, or upstream on the Audi A3. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement, since physical damage can shorten service life and affect signal quality. Confirm thread size, connector shape, and wire count against the original part before installation.

Quality Assurance

Walker Products manufactures engine management and oxygen/air-fuel sensors as OE replacement parts and operates as an Automotive ISO9001/TS 16949 certified company. Since 1946, the brand has supplied engine management sensors and fuel system components for vehicle service applications.