Walker 350-34423 Oxygen Sensor

Walker 350-34423 Oxygen Sensor Overview

Walker Products 350-34423 is a heated oxygen sensor built as an OE-style replacement for specific GM and Saturn applications. It is engineered for the correct fitment position and ECU feedback, helping maintain accurate air-fuel monitoring on vehicles such as the Chevrolet Silverado 1500, Tahoe, and GMC Sierra 1500.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for direct replacement use. The 350-34423 follows the application-specific approach needed for downstream and upstream service on selected 2002-2008 vehicles.

Key Features

• Heated oxygen sensor for faster operating temperature response
• Specific-fit design for confirmed vehicle applications
• 4-wire configuration with female connector
• Threaded mounting type with 18.0 mm thread diameter
• 14.49 in. wiring harness length and 18.03 in. overall length
• Radiused polygon connector shape for application-specific fitment
• Built for ECU feedback on emissions and fuel-control systems

Detailed Description

Walker 350-34423 is an oxygen sensor for emissions control systems that reads exhaust oxygen content and sends data to the engine control unit. That signal supports fuel-trim correction and diagnostic monitoring on compatible vehicles. This part number is listed for multiple positions, including upstream and downstream left or right applications depending on the vehicle.

Compatible vehicle coverage includes 2002-2003 Saturn L200 and LW200, 2002-2003 Chevrolet Trailblazer and Trailblazer EXT, 2003-2005 Chevrolet Astro and GMC Safari, 2006-2007 Chevrolet Tahoe and Silverado 1500, 2006-2007 GMC Sierra 1500 and Yukon, and 2007 Cadillac Escalade models. Walker Products 350-34423 is also listed for the 2008 Chevrolet Captiva Sport upstream position.

What It Helps Address

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

Installation Notes and Tips

Confirm the exact position before ordering, since this part is listed for upstream, downstream left, downstream right, and downstream applications on different vehicles. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. On vehicles with stored fault codes, verify the related circuit and exhaust system condition so the replacement sensor can operate correctly.

For fitment-based searches, this part is commonly referenced for downstream oxygen sensor replacement on Chevrolet Silverado 1500 and GMC Sierra 1500 applications, as well as upstream service on Chevrolet Captiva Sport and Saturn L200/LW200 models.

Quality Assurance

Walker Products manufactures engine management sensors as OE replacement components for specific applications and positions. The brand has operated since 1946 and is ISO 9001/TS 16949 certified, with production focused on application-specific fitment and ECU feedback requirements.