Walker 350-34989 Oxygen Sensor - Downstream

OE Replacement Oxygen Sensor for Volkswagen and Audi

Walker Products 350-34989 is a heated oxygen sensor built as a specific-fit OE replacement for select Volkswagen and Audi applications. It is engineered to provide the ECU with the feedback needed for accurate fuel control and emissions monitoring, including upstream and downstream positions where listed.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment. The 350-34989 follows that approach with the correct mounting style, connector design, wire count, and harness length for the listed vehicles.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed Volkswagen and Audi applications
• Threaded mounting type with 18.0 mm thread diameter
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector
• Wiring harness length: 25.39 in.
• Overall length: 28.54 in.
• Supports upstream and downstream positions where specified

Detailed Description

Walker Products part number 350-34989 is an emission control oxygen sensor designed for direct replacement use on select 2020-2021 Volkswagen Virtus upstream, 2020 Volkswagen Jetta upstream, 2016-2017 Volkswagen Caddy upstream, and multiple Audi A8 Quattro downstream applications. It is built to match the application-specific fitment position and deliver the diagnostic feedback expected by the ECU. For buyers searching for a Volkswagen Jetta upstream oxygen sensor, Volkswagen Virtus upstream O2 sensor, or Audi A8 Quattro downstream oxygen sensor, this part number provides a targeted OE-style solution.

This part cross-references no listed aftermarket part numbers in the provided data. The Walker Products 350-34989 is part of the Walker Products Aftermarket line, which is focused on replacement engine management sensors for modern vehicle electronics and emissions systems.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect exhaust feedback
• Rough engine operation from inaccurate air-fuel monitoring
• Elevated exhaust emissions from a failing sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Confirm the sensor position before ordering, since this part is listed for both upstream and downstream locations depending on vehicle application. Inspect the sensor, wiring harness, and connector for physical damage before installation, and verify the threaded mounting point and connector style match the original unit. For best results, compare the existing sensor length, wire count, and connector shape to the replacement before installation.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, the brand has supplied engine management and fuel system components for vehicle applications worldwide.