Walker 350-34343 Oxygen Sensor - Downstream Left or Downstream Right

Walker 350-34343 Oxygen Sensor Overview

Walker Products 350-34343 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 vehicles, including 2006-2007 Buick Rainier, Chevrolet Trailblazer, GMC Envoy, and Saab 9-7x applications.

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors for direct application fitment. This sensor uses a threaded mounting design, a 4-wire heated configuration, and a male radiused polygon connector for the listed downstream positions.

Key Features

• Part number: 350-34343
• Heated oxygen sensor for downstream use
• 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: 11.34
• Overall length: 14.88
• Male radiused polygon connector

Detailed Product Description

Walker Products 350-34343 is an oxygen sensor designed for downstream right and downstream left locations on select 2006 and 2007 GM and Saab platforms. Confirmed applications include 2007 Buick Rainier, 2007 Chevrolet Express 1500, 2007 Chevrolet Trailblazer, 2007 GMC Envoy, 2007 GMC Savana 1500, 2007 Saab 9-7x, plus 2006 Buick Rainier, 2006 Chevrolet SSR, 2006 Chevrolet Trailblazer, 2006 Chevrolet Trailblazer EXT, 2006 GMC Envoy, 2006 GMC Envoy XL, 2006 Isuzu Ascender, and 2006 Saab 9-7x.

As a heated oxygen sensor, this unit is used by the engine control system to monitor exhaust oxygen content and support proper air-fuel management. For vehicles with fault codes, a failing sensor can contribute to poor engine performance, higher fuel consumption, increased exhaust emissions, or an illuminated malfunction indicator light. The sensor, wiring harness, and connector should be inspected for physical damage during diagnosis.

What This Oxygen Sensor Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect fuel trim or air-fuel feedback on supported vehicles
• Reduced fuel economy caused by a worn sensor
• Elevated exhaust emissions from inaccurate exhaust monitoring
• Poor drivability tied to sensor signal issues

Installation Notes and Tips

Verify the connector shape, wire count, thread diameter, and mounting position before installation. This part is a specific-fit sensor, so match the vehicle year, make, model, and downstream left or downstream right location exactly. Inspect the harness and connector for heat damage, corrosion, or broken terminals before replacing the sensor. For 2006-2007 Buick Rainier, Chevrolet Trailblazer, GMC Envoy, and Saab 9-7x applications, confirm the correct downstream side and connector style before service.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-34343 is manufactured as an OE-style replacement sensor for the listed applications and fitment positions.