Walker 350-34939 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Walker 350-34939 Oxygen Sensor Overview

Walker Products 350-34939 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 Chevrolet, GMC, Buick, and Cadillac vehicles.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for exact application fitment. The 350-34939 follows that approach with a threaded mounting design, 4-wire configuration, and a radiused polygon connector for direct replacement use on the listed downstream positions.

Key Features

• Heated oxygen sensor for downstream engine management feedback
• Specific fit application for listed vehicle positions
• 4-wire design with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 12.32
• Overall length: 15.87
• Male connector with radiused polygon shape

Detailed Description

The Walker 350-34939 oxygen sensor is intended for downstream monitoring on a wide range of GM vehicles, including Chevrolet Camaro, Colorado, Malibu, Silverado, Tahoe, and GMC Canyon applications. It is also listed for Buick, Cadillac, and GMC models where the downstream sensor position is specified in the fitment data. If you are replacing a downstream oxygen sensor on a 2022 Chevrolet Colorado, 2018-2019 Chevrolet Silverado 1500, or 2017-2020 Cadillac Escalade, this part number is listed for those OE replacement positions.

As a heated sensor, it helps the ECU monitor exhaust conditions after the catalytic converter and maintain proper diagnostic feedback. A failing sensor can contribute to poor engine operation, higher fuel use, increased emissions, or a malfunction indicator light. When replacing the sensor, inspect the wiring harness and connector for damage, since physical wear can shorten service life.

This part cross-references no listed alternate part numbers in the provided data. Walker Products 350-34939 is part of the Walker Products Aftermarket engine management line, developed for OE-style replacement fitment across supported applications.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect exhaust feedback to the ECU
• Rough running caused by sensor signal issues
• Reduced fuel economy from inaccurate air-fuel monitoring
• Elevated exhaust emissions from a worn sensor

Installation Notes and Tips

• Confirm the exact downstream position before ordering: downstream right, downstream left, or downstream.
• Verify connector shape, wire count, and thread diameter against the original sensor.
• Inspect the harness and connector for heat damage, corrosion, or abrasion before installation.
• Use the vehicle’s service information to confirm bank and sensor location on multi-bank engines.
• Clear stored fault codes after installation and verify proper ECU feedback.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-34939 is manufactured for specific application fitment and diagnostic feedback requirements on the listed vehicles.

Compatible vehicle coverage includes 2022-2024 Chevrolet Camaro, 2024 Chevrolet Montana, 2024 Chevrolet Trax, 2022 Chevrolet Colorado, 2022 Chevrolet Malibu, 2021-2022 Chevrolet Tracker, and additional Buick, Cadillac, Chevrolet, and GMC downstream applications.