Walker 350-35147 Oxygen Sensor - Upstream

Walker 350-35147 Oxygen Sensor Overview

Walker Products 350-35147 is an upstream oxygen sensor engineered as an OE-style replacement for select Audi and Volkswagen applications. It is built for the specified vehicle position and provides the ECU with the feedback needed for proper fuel control and emissions monitoring.

Compatible with 2018-2024 Audi A3, Audi A3 Quattro, Audi S3, Audi A1, Audi Q3, and 2019-2024 Volkswagen Tiguan, Atlas, Atlas Cross Sport, and Teramont applications listed below.

Key Features

• Upstream oxygen sensor for emissions and air-fuel monitoring
• OE replacement design for the listed vehicle applications
• Application-specific fitment and connector position
• Supports ECU feedback for fault detection and fuel management
• Walker Products Aftermarket line for engine management and sensor replacement

Detailed Application Information

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for direct replacement use. Part number 350-35147 is matched to the upstream position on the listed Audi and Volkswagen models, including Audi A3, Audi A3 Quattro, Audi S3, Volkswagen Tiguan, Atlas, Atlas Cross Sport, and Teramont. This sensor is used to help the engine control unit monitor exhaust oxygen content so the vehicle can maintain proper air-fuel strategy and emissions performance.

This part cross-references no listed interchange numbers in the provided data. Walker 350-35147 is a fitment-specific replacement for vehicles that require an upstream oxygen sensor in the positions shown.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect air-fuel feedback
• Rough running or drivability issues tied to sensor signal loss
• Elevated exhaust emissions from a failing upstream sensor
• Stored ECU fault codes for the affected sensor circuit

Installation Notes and Tips

Verify the vehicle’s exact year, make, model, and upstream sensor location before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear, since damaged wiring can shorten sensor life and trigger fault codes. Confirm the original fault code and compare the sensor position to the application notes, especially on 2019-2024 Volkswagen Tiguan and 2018-2024 Audi A3 applications where multiple upstream references appear in the fitment data.

• Fits 2022-2024 Audi A3, Upstream
• Fits 2022-2024 Volkswagen Tiguan, Upstream
• Fits 2022-2023 Volkswagen Atlas, Upstream
• Fits 2022-2023 Volkswagen Atlas Cross Sport, Upstream
• Fits 2022-2023 Volkswagen Teramont, Upstream
• Fits 2020-2022 Audi A1, Upstream
• Fits 2022 Audi Q3, Upstream
• Fits 2020-2021 Volkswagen Tiguan, Upstream
• Fits 2018-2020 Audi A3, Upstream
• Fits 2019 Volkswagen Tiguan, Upstream
• Fits 2018 Audi A3 Quattro, Upstream
• Fits 2018 Audi S3, Upstream

Quality Assurance

Walker Products has produced engine management and sensor components since 1946 and manufactures this oxygen sensor as an OE replacement for the specified application. The company is ISO 9001 and TS 16949 certified, with product development focused on application-specific fitment and ECU feedback requirements.