Walker 350-34539 Oxygen Sensor

Walker 350-34539 Oxygen Sensor Overview

Walker Products 350-34539 is a heated oxygen sensor built as a specific-fit OE replacement for select Ford, Lincoln, Mazda, and Mercury applications. It is engineered to provide the ECU with the exhaust feedback needed for proper fuel control and emissions monitoring.

For vehicles such as the Ford F-150, Ford Ranger, and Ford Explorer, this oxygen sensor supports accurate upstream or downstream signal reporting based on the listed position. The Walker Products Aftermarket line focuses on application-specific engine management sensors for direct replacement use.

Key Features

• Heated oxygen sensor design for faster operating temperature
• Specific-fit application for listed vehicle positions
• 4-wire configuration with male connector
• Threaded mounting type with 18.0 mm thread diameter
• Overall length: 18.82 in.; wiring harness length: 15.28 in.
• Radiused polygon connector shape for the listed OE-style interface

Detailed Description

Walker Products 350-34539 is designed for emissions control systems that rely on precise oxygen sensor feedback. It is listed for upstream and downstream positions across multiple Ford truck and SUV platforms, including Ford F-150, Ford Ranger, Ford Explorer, Ford Expedition, Lincoln Mark LT, Lincoln Navigator, Mazda B3000, Mazda B4000, and Mercury Mountaineer. This part number is also listed for the 2016 Ford Fiesta downstream application.

As an OE replacement sensor, it is intended to match the specified fitment position and provide the diagnostic input required by the ECU. Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946, and the Walker Products Aftermarket line is built around application-specific replacement coverage.

This part cross-references no additional part numbers in the provided data.

What It Helps Address

• Check engine light related to oxygen sensor faults
• Poor fuel economy caused by incorrect exhaust feedback
• Rough engine operation from inaccurate air-fuel readings
• Higher exhaust emissions from a failing sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

• Verify the exact year, make, model, and sensor position before ordering.
• Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear.
• Confirm the threaded mounting location and connector style match the original unit.
• Use the listed upstream or downstream position exactly as shown for the vehicle application.

Quality Assurance

Walker Products is an Automotive ISO9001/TS 16949 certified company. The brand develops engine management sensors as OE-style replacements for specific vehicle applications, with cataloging and packaging support built for aftermarket service.