Walker 350-34997 Oxygen Sensor - Downstream

Walker 350-34997 Oxygen Sensor Overview

Walker Products 350-34997 is a heated oxygen sensor built as a specific-fit OE replacement for downstream applications. It is engineered to provide the ECU with the feedback needed for fuel control and emissions monitoring on supported vehicles, including Ford Ranger, Ford Transit Connect, Ford Escape, Volkswagen Jetta, and Audi A3 applications.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for direct-fit replacement use. The 350-34997 follows the application-specific approach expected for modern emissions systems, with the correct connector style, wire count, and sensor configuration for the listed downstream positions.

Key Features

• Heated oxygen sensor for downstream emissions monitoring
• Specific-fit design for OE replacement applications
• 4-wire configuration with female connector
• 29.06 in. wiring harness length and 32.6 in. overall length
• 18.00 mm thread diameter
• Wire gauge: 20
• Fits downstream positions on select Ford, Volkswagen, and Audi models

Fitment Details

• Fits 2022-2024 Volkswagen Jetta, downstream, OE replacement.
• Fits 2023 Audi A3, downstream, OE replacement.
• Fits 2022 Audi A3, N/A, OE replacement.
• Fits 2017-2020 Ford Ranger, downstream, OE replacement.
• Fits 2020 Ford Transit Connect, downstream, OE replacement.
• Fits 2018 Ford Escape, downstream, to 08/28/2017; B1S2; Al 08/28/2017; Walker Products Aftermarket.
• Fits 2018 Ford Transit Connect, downstream, to 05/28/2018; OE replacement.
• Fits 2017 Ford Escape, downstream, fits downstream bank 1 sensor 2 on specific vehicle models; Walker Products Aftermarket.
• Fits 2016-2017 Ford Transit Connect, downstream, fits downstream bank 1 sensor 2 on specific vehicle models; Walker Products Aftermarket.

What This Sensor Helps Address

• Check engine light related to downstream oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation tied to emissions sensor faults
• Increased exhaust emissions from a failing sensor
• Stored ECU fault codes for the affected sensor circuit

Installation Notes

Confirm the exact vehicle, model year, and downstream position before ordering. Match the connector, wire count, and thread size to the original sensor, and inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. This part number, 350-34997, is listed for specific-fit applications only and should be installed in the correct downstream location for the vehicle.

For fitment-based searches, this oxygen sensor is a direct replacement for select Ford Ranger and Ford Transit Connect downstream applications, as well as Volkswagen Jetta and Audi A3 downstream applications. If the vehicle has stored ECU fault codes, verify the fault source before replacing the sensor.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and operates as an ISO 9001 / TS 16949 certified company. The 350-34997 is built to support OE-style replacement requirements for the listed applications and is backed by Walker Products’ established manufacturing and catalog support process.