Walker 350-34928 Oxygen Sensor - Downstream

Walker 350-34928 Oxygen Sensor Overview

Walker Products 350-34928 is a heated downstream oxygen sensor built as a specific-fit OE replacement for select Audi, Porsche, and Volkswagen applications. It is engineered to provide the ECU with the correct feedback for emissions and fuel-control monitoring on vehicles such as the Audi A4, Audi A5, Audi Q7, and Porsche Macan.

Walker Products Aftermarket focuses on application-specific engine management sensors, and this part number is matched to the required mounting position, connector style, and wiring layout for the listed vehicles.

Key Features

• Heated oxygen sensor for downstream placement
• Specific-fit design for direct application matching
• 4-wire configuration with 20-gauge wiring
• 14.29 in. wiring harness length and 17.83 in. overall length
• 18.0 mm threaded mounting design
• Male connector with radiused polygon shape
• Built for ECU feedback on emissions-related systems

Detailed Description

The Walker 350-34928 oxygen sensor is intended for downstream bank 1 sensor applications on select 2013-2019 Audi, Porsche, and Volkswagen models. It is a heated sensor with a threaded mounting type, designed to match the original sensor location and electrical interface so the vehicle’s engine management system can monitor exhaust output correctly. This part number is listed for Audi A4, A4 allroad, A4 Quattro, A5, A5 Quattro, A5 Sportback, A6, A6 Quattro, Q7, Porsche Macan, and Volkswagen Jetta applications where the downstream sensor position is specified.

Walker Products Aftermarket 350-34928 is built for vehicles that rely on accurate oxygen sensor input to manage emissions performance and diagnostic reporting. If the original sensor has failed, the vehicle may store fault codes and show drivability or emissions-related symptoms. This part cross-references Bosch 17098 for the same application.

What This Sensor Helps Address

• Check engine light related to downstream oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation tied to emissions sensor failure
• Elevated exhaust emissions from a degraded sensor signal
• Stored ECU fault codes for bank 1 sensor 2 or bank 1 sensor 3 positions

Installation Notes and Fitment

Fits 2019 Audi A4, downstream; 2019 Audi A4 allroad, downstream; 2019 Audi A4 Quattro, downstream; 2019 Audi A5 Quattro, downstream; 2019 Audi A5 Sportback, downstream; 2019 Audi Q7, downstream. Fits 2017-2018 Audi A4, downstream; 2017-2018 Audi A4 allroad, downstream; 2017-2018 Audi A4 Quattro, downstream; 2018 Audi A5, downstream; 2018 Audi A5 Quattro, downstream; 2018 Audi A5 Sportback, downstream; 2016-2018 Audi A6, downstream; 2016-2018 Audi A6 Quattro, downstream; 2017-2018 Audi Q7, downstream. Fits 2017-2018 Porsche Macan, downstream; 2016 Audi Q7, downstream; 2013-2014 Volkswagen Jetta, downstream; 2013 Audi A4 Quattro, downstream.

Verify connector shape, thread diameter, and sensor position before installation. Inspect the wiring harness and connector for heat damage, abrasion, or corrosion, since damaged related components can shorten sensor life and affect diagnostic accuracy.

Quality Assurance

Walker Products has manufactured engine management components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-34928 is produced as an application-specific replacement to support the diagnostic feedback required by the ECU on the listed vehicles.