Walker 350-34454 Oxygen Sensor - Upstream

Walker 350-34454 Oxygen Sensor Overview

Walker Products 350-34454 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for select Mitsubishi applications. It is built for upstream placement and is designed to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Compatible with 2003-2006 Mitsubishi Outlander, upstream, this oxygen sensor is a direct-fit option for drivers addressing sensor-related fault codes, poor engine performance, or elevated fuel consumption. The Walker Products Aftermarket line focuses on application-specific engine management components, including oxygen and air-fuel sensors.

Key Features

• Part number: 350-34454
• Heated oxygen sensor for faster operating response
• Specific fit for the listed Mitsubishi Outlander upstream application
• 4-wire design with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for vehicle-specific connection
• Wiring harness length: 21.97 in.
• Overall length: 25.51 in.

Product Details

Walker Products 350-34454 is engineered for the upstream oxygen sensor location on 2003-2006 Mitsubishi Outlander models. As part of the Walker Products Aftermarket engine management line, it is built to match the application, fitment position, and ECU feedback requirements of the original sensor. The heated design helps the sensor reach operating temperature efficiently, supporting accurate exhaust monitoring and air-fuel control.

This part number is a direct replacement for the listed Mitsubishi Outlander fitment and is intended for vehicles that require an upstream oxygen sensor at Bank 1 Sensor 1. Walker Products 350-34454 is also referenced in the same application as a front oxygen sensor on select vehicle configurations.

Common Issues This Sensor May Address

• Check engine light or malfunction indicator light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel mixture control
• Higher exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

Verify the connector shape, wire count, thread diameter, and upstream position before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or abrasion, since physical damage can shorten service life and affect ECU readings. Confirm the vehicle uses the listed 2003-2006 Mitsubishi Outlander upstream configuration before ordering.

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 350-34454 oxygen sensor is manufactured for the specified application and fitment position to support proper diagnostic feedback to the ECU.