Walker 350-34489 Oxygen Sensor - Downstream, Upstream, Upstream Left or Upstream Right

Walker 350-34489 Oxygen Sensor Overview

Walker Products 350-34489 is a heated oxygen sensor built as a specific-fit OE replacement for select GM, Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, and Saab applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment. The 350-34489 is designed around the required mounting position, connector style, and wiring layout for the listed vehicles, including Buick LaCrosse, Chevrolet Colorado, and GMC Canyon applications.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed vehicle applications
• 4-wire configuration with 20-gauge wiring
• Female connector with radiused polygon shape
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 17.24 in.
• Overall length: 20.79 in.

Detailed Description

Walker 350-34489 is an OE-style oxygen sensor intended for downstream and upstream positions depending on the vehicle application. It is used on models such as the 2011-2017 Buick Regal downstream, 2006-2012 Chevrolet Colorado upstream, 2006-2012 GMC Canyon upstream, and 2014-2015 Chevrolet Express 3500 downstream right. The sensor is built to match the required fitment position and provide the ECU with the feedback needed for closed-loop fuel management and emissions monitoring.

This part number, 350-34489, is also listed for applications including 2011-2016 Buick LaCrosse downstream, 2015 Buick Verano upstream, 2014 Chevrolet Impala downstream, 2013-2014 Chevrolet Malibu downstream, and 2006-2009 Cadillac STS upstream left or upstream right. For buyers searching by vehicle, this oxygen sensor supports long-tail fitment needs such as a downstream oxygen sensor for Buick Regal, an upstream oxygen sensor for Chevrolet Colorado, or a replacement oxygen sensor for GMC Canyon.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel readings
• Elevated exhaust emissions from a failing sensor
• Fault codes stored in the ECU for sensor-related systems

Installation Notes and Tips

Confirm the exact position before ordering, since this part is listed for upstream, downstream, upstream left, upstream right, and downstream right applications. Inspect the sensor, wiring harness, and connector for physical damage before installation, and verify the connector shape, thread diameter, and harness length against the original part. For best results, clear any stored fault codes after installation and confirm the repair with a scan tool.

Quality Assurance

Walker Products has produced engine management components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-34489 is manufactured as a specific application replacement to support the diagnostic requirements of the vehicle ECU.

This part cross-references Walker Products Aftermarket 350-34489 for the same application.