Walker 350-34455 Oxygen Sensor - Downstream Left

Walker 350-34455 Oxygen Sensor Overview

Walker Products 350-34455 is a heated oxygen sensor built as a specific-fit OE replacement for downstream left applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring on select Chevrolet Silverado, Suburban, GMC Sierra, and Yukon models.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment, and the 350-34455 follows that approach with the correct connector style, wiring length, and threaded mounting design for the listed vehicles.

Key Features

• Heated oxygen sensor for downstream left placement
• Specific fit for direct application matching
• 4-wire design with 20-gauge wiring
• Radiused polygon male connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 19.21 in.
• Overall length: 22.76 in.

Detailed Description

The Walker 350-34455 oxygen sensor is designed for vehicles that require a downstream left sensor to monitor exhaust output after the catalytic converter. On the listed Chevrolet Silverado 1500 HD, Silverado 2500, Silverado 2500 HD, Silverado 3500, Suburban 2500, GMC Sierra 1500 HD, Sierra 2500, Sierra 2500 HD, Sierra 3500, Yukon, Yukon XL 1500, and Yukon XL 2500 applications, this sensor supports ECU feedback for emissions-related diagnostics and fuel system correction. If the original sensor is aging or damaged, the vehicle may store fault codes, run poorly, increase fuel consumption, or illuminate the malfunction indicator light.

This part number, 350-34455, is built for the specified position and connector layout, making it a direct replacement choice for downstream left oxygen sensor service on 2000-2001 Chevrolet Silverado and Suburban models and 2001 GMC Sierra and Yukon models. Walker Products Aftermarket has supplied engine management components since 1946 and manufactures sensors to application-specific requirements.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Rough engine operation caused by inaccurate exhaust feedback
• Higher fuel consumption from incorrect air-fuel correction
• Elevated exhaust emissions from a failing sensor
• Diagnostic trouble codes tied to the affected sensor circuit

Installation Notes and Tips

Verify the downstream left position before ordering and compare the connector shape, wire count, and thread size to the original sensor. Inspect the sensor wiring harness and connector for heat damage, corrosion, or abrasion before installation, since physical damage can shorten sensor life. Confirm the vehicle application against the listed fitment for 2000-2001 Chevrolet Silverado and Suburban models and 2001 GMC Sierra and Yukon models.

Quality Assurance

Walker Products is an Automotive ISO9001/TS 16949 certified company, and its sensor line is developed as an OE-style replacement for specific vehicle applications. This part cross-references no listed alternate part numbers for the same application.