Walker 350-34145 Oxygen Sensor - Downstream Left

Walker 350-34145 Oxygen Sensor Overview

Walker Products 350-34145 is a heated oxygen sensor built as a specific-fit OE replacement for select Chevrolet and GMC trucks and SUVs. It is engineered to provide the ECU with the exhaust feedback needed for proper fuel control and emissions monitoring.

Compatible with 2001-2002 Chevrolet Silverado 2500 HD, 2001-2002 Chevrolet Silverado 3500, 2001-2002 Chevrolet Suburban 2500, 2001-2002 GMC Sierra 2500 HD, 2001-2002 GMC Sierra 3500, 2001-2002 GMC Yukon XL 2500, and 2002 Chevrolet Avalanche 2500 in the downstream left position.

Key Features

• Part number: 350-34145
• Heated oxygen sensor for downstream left placement
• Specific-fit design for direct application matching
• 4-wire configuration with 20-gauge wiring
• Female connector with radiused polygon shape
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 19.21 in.; overall length: 22.76 in.

Detailed Description

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors that are application-specific and built to deliver the diagnostic feedback expected by the vehicle ECU. The 350-34145 is intended for downstream left service on select Chevrolet Silverado 2500 HD, Silverado 3500, Suburban 2500, Avalanche 2500, and GMC Sierra 2500 HD, Sierra 3500, and Yukon XL 2500 models from 2001-2002. If the original sensor is failing, the vehicle may store fault codes, run rich or lean, increase fuel use, raise emissions, or trigger the malfunction indicator light.

This part cross-references no listed aftermarket part numbers for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Poor fuel economy caused by incorrect exhaust feedback
• Elevated exhaust emissions from inaccurate air-fuel monitoring
• Stored ECU fault codes tied to the affected sensor circuit
• Rough engine operation linked to sensor signal loss

Installation Notes and Tips

Verify the downstream left location before installation and compare the connector, thread size, harness length, and wire count to the original sensor. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life and affect signal quality.

Quality Assurance

Walker Products is an ISO 9001 / TS 16949 certified automotive manufacturer with a long history in engine management and fuel system components. The 350-34145 is built as a vehicle-specific replacement to support the diagnostic needs of the ECU on the listed Chevrolet and GMC applications.