Walker 350-34788 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Walker 350-34788 Oxygen Sensor Overview

Walker Products 350-34788 is a heated oxygen sensor built as a specific-fit OE replacement for select Audi and Volkswagen applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance on downstream sensor locations.

For vehicles such as the Audi R8, Audi A3, Volkswagen Atlas, and Volkswagen Jetta, accurate downstream oxygen sensor operation is important for drivability and emissions monitoring. This Walker Products Aftermarket sensor is matched to the application, mounting position, and connector style for direct replacement service.

Key Features

• Heated oxygen sensor for downstream applications
• Specific-fit design for select Audi and Volkswagen models
• Threaded mounting type with 18.0 mm thread diameter
• 4-wire configuration with male radiused polygon connector
• Wiring harness length: 27.55 in.
• Overall length: 30.51 in.
• Walker Products Aftermarket part number 350-34788

Product Details

Walker Products Engine Management and Oxygen/Air-Fuel sensors are developed as OE-style replacements for worldwide vehicle coverage. Part number 350-34788 is built for the specified fitment position so the ECU receives the correct sensor feedback after installation. The Walker Products line has supported engine management and fuel system applications since 1946, and this sensor follows the same application-specific approach for downstream oxygen sensor service.

This part cross-references common OE-style replacement needs for the same application, including Bosch 17025 and Denso 234-9005.

What This Sensor Helps Address

• Illuminated malfunction indicator light related to downstream oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation tied to incorrect air-fuel monitoring
• Elevated exhaust emissions from a failing sensor
• Stored ECU fault codes for the affected sensor circuit

Installation Notes and Fitment

Fits 2022-2023 Audi R8, downstream right; 2020-2021 Audi R8, downstream right; 2017-2018 Audi R8, downstream right; 2020-2021 Audi R8, downstream left; 2017-2018 Audi R8, downstream left; 2022-2023 Volkswagen Atlas, downstream; 2022-2023 Volkswagen Atlas Cross Sport, downstream; 2021-2023 Volkswagen Teramont, downstream; 2019 Volkswagen Teramont, downstream; 2020-2022 Audi A1, downstream; 2018-2021 Volkswagen Atlas, downstream; 2020-2021 Volkswagen Atlas Cross Sport, downstream; 2015-2020 Audi A3, downstream; 2017-2019 Volkswagen Golf Alltrack, downstream; 2019 Volkswagen Golf R, downstream; 2015-2019 Volkswagen Golf SportWagen, downstream; 2019 Volkswagen Passat, downstream; 2015-2018 Audi A3 Quattro, downstream; 2016-2018 Audi S3, downstream; 2016-2018 Audi TT Quattro, downstream; 2016-2018 Audi TTS Quattro, downstream; 2018 Volkswagen Beetle, downstream; 2015-2018 Volkswagen Golf, downstream; 2015-2018 Volkswagen Golf R, downstream; 2015-2018 Volkswagen GTI, downstream; 2013-2018 Volkswagen Jetta, downstream; 2013-2017 Volkswagen Beetle, downstream; 2015-2017 Volkswagen Passat, downstream; 2015-2016 Audi A8 Quattro, downstream; 2015 Audi S3, downstream; 2014-2015 Volkswagen Beetle, downstream; 2015 Volkswagen Beetle, downstream; 2015 Volkswagen Jetta, downstream.

Before installation, inspect the sensor wiring harness and connector for damage, and verify the downstream bank/sensor location against the vehicle’s ECU fault code and service information. Confirm the threaded mounting point and connector orientation match the original sensor.

Quality Assurance

Walker Products manufactures engine management sensors as OE replacement parts for specific applications and fitment positions. The brand operates as an ISO 9001/TS 16949 certified company, with application-focused cataloging and production standards for aftermarket service.