Walker 350-34499 Oxygen Sensor - Downstream or Downstream Right

Walker 350-34499 Oxygen Sensor Overview

Walker Products 350-34499 is a heated downstream oxygen sensor built as an OE-style replacement for specific Audi and Volkswagen applications. It is engineered for the correct fitment position, connector style, and ECU feedback required by the vehicle’s emissions system.

Use this sensor when servicing a downstream oxygen sensor circuit on vehicles such as the Audi A4 allroad, Audi A4 Quattro, Audi A5 Sportback, Audi Q5, Audi Q5 Sportback, Audi A5 Quattro, Audi Q7, Audi A3, and Volkswagen Bora.

Key Features

• Heated oxygen sensor for downstream placement
• Specific fit design for application-matched installation
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 25.12 in.; overall length: 28.66 in.

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors engineered for OE replacement use. Part number 350-34499 is built for vehicles that require a heated downstream sensor to relay the proper diagnostic signal to the ECU. In service, a failing sensor can contribute to poor engine operation, higher fuel use, increased exhaust emissions, and a malfunction indicator light. Checking the sensor, connector, and wiring harness for damage is an important part of diagnosis.

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

What This Sensor Helps Address

• Downstream oxygen sensor fault codes
• Malfunction indicator light related to the emissions system
• Rough engine performance caused by inaccurate exhaust feedback
• Increased fuel consumption from a degraded sensor signal
• Elevated exhaust emissions from a worn sensor circuit

Installation Notes

• Fits 2021-2025 Audi A4 allroad, downstream.
• Fits 2021-2025 Audi A4 Quattro, downstream.
• Fits 2021-2025 Audi A5 Sportback, downstream.
• Fits 2022-2025 Audi Q5, downstream.
• Fits 2022-2025 Audi Q5 Sportback, downstream.
• Fits 2021-2024 Audi A5 Quattro, downstream.
• Fits 2021 Audi Q5, downstream, 4-pin connector; OE replacement.
• Fits 2021 Audi Q5 Sportback, downstream, 4-pin connector; OE replacement.
• Fits 2015 Audi Q7, downstream right, compatible downstream oxygen sensor with bank 1 sensor 2; OE replacement.
• Fits 2015 Audi Q7, downstream right, downstream oxygen sensor compatible with right bank 2; OE replacement.
• Fits 2011-2014 Audi Q7, downstream right, install downstream oxygen sensor on the right side; OE replacement.
• Fits 2010 Volkswagen Bora, downstream.
• Fits 2008-2009 Audi A3, downstream, OE replacement.

Confirm connector shape, thread diameter, and sensor position before installation. For Audi Q7 downstream right applications, verify the bank and side callout against the vehicle service information. Part number 350-34499 is intended for direct application matching, so correct vehicle identification is essential.

Quality Assurance

Walker Products has supplied engine management and oxygen sensor components since 1946 and manufactures to automotive ISO 9001/TS 16949 standards. The Walker 350-34499 is produced as an application-specific replacement sensor for consistent ECU feedback and emissions-system service.