Walker 350-34194 Oxygen Sensor

Walker 350-34194 Oxygen Sensor Overview

Walker 350-34194 is a heated oxygen sensor built as an OE-style replacement for specific Audi, Volkswagen, and Bentley applications. It is engineered for the correct fitment position and ECU feedback on downstream monitoring systems, including Audi A8 Quattro downstream applications and Volkswagen Touareg downstream left coverage.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific replacement, and this part number follows that approach with vehicle-specific connector, wiring, and mounting details.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for the listed vehicle applications
• 4-wire configuration with 22-gauge wiring
• Radiused polygon male connector for application matching
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 57.6
• Overall length: 61.14

Detailed Description

Walker 350-34194 is designed for vehicles that rely on downstream oxygen sensor feedback to help the ECU monitor exhaust performance and catalyst efficiency. It is listed for 2003-2009 Audi A8 Quattro downstream applications, 2003 Audi Allroad Quattro downstream left and downstream right, 2003 Bentley Continental downstream left and downstream right, 2003 Volkswagen R32 downstream left and downstream front, and 2004-2007 Volkswagen Touareg downstream left. This makes it a strong match for buyers searching for a downstream oxygen sensor for Audi A8 Quattro, a Volkswagen Touareg downstream left oxygen sensor, or a replacement oxygen sensor for Volkswagen R32 and Bentley Continental applications.

This part number, 350-34194, is built for specific placement on the vehicle so the sensor signal aligns with the ECU’s expected diagnostic input. Walker Products notes that a failing sensor can contribute to poor engine operation, higher fuel use, increased emissions, or a malfunction indicator light. Wiring, connector condition, and harness damage should also be checked during diagnosis.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect exhaust feedback to the ECU
• Higher fuel consumption caused by sensor faults
• Increased exhaust emissions from a degraded sensor
• Poor engine operation tied to oxygen sensor signal issues

Installation Notes and Tips

Confirm the exact position before ordering, since this application covers downstream, downstream left, downstream right, and downstream front locations depending on vehicle. Verify connector shape, wire count, thread diameter, and harness length against the original sensor before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or abrasion, as these conditions can shorten service life and affect signal quality.

Quality Assurance

Walker Products has manufactured engine management components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The Walker Products Aftermarket line is focused on application-specific replacement sensors built to match the vehicle’s original diagnostic requirements.