Walker 350-34345 Oxygen Sensor - Upstream

Walker 350-34345 Oxygen Sensor Overview

Walker Products 350-34345 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for select Toyota and Pontiac applications. It is built for upstream placement and provides the ECU with the feedback needed to monitor air-fuel control and emissions performance.

Compatible With 2003-2006 Toyota Matrix, 2005-2006 Toyota Corolla, and 2004-2006 Pontiac Vibe in upstream positions, this Walker Products Aftermarket sensor is a direct-fit solution for vehicles that need accurate exhaust feedback. The 350-34345 part number is designed around the application, connector style, and mounting location.

Key Features

• Heated oxygen sensor for upstream engine management feedback
• Specific-fit design for the listed Toyota Matrix, Toyota Corolla, and Pontiac Vibe applications
• 4-wire configuration with 22-gauge wiring
• Radiused polygon male connector for application-specific connection
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 19.21; overall length: 22.76

Product Details

Walker Products Aftermarket focuses on OE replacement engine management components, and the 350-34345 oxygen sensor follows that approach with application-specific fitment and upstream placement. As a heated sensor, it helps the ECU monitor exhaust conditions more quickly after startup, which is important for fuel control and emissions diagnostics. This part number is listed for 2003-2006 Toyota Matrix, 2005-2006 Toyota Corolla, and 2004-2006 Pontiac Vibe upstream locations, including Bank 1 Sensor 1 applications where noted.

This part cross-references Denso 234-9001 for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Rough running caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Elevated exhaust emissions from sensor degradation
• Diagnostic trouble codes stored in the ECU for sensor-related issues

Installation Notes

Verify the connector shape, wire count, thread diameter, and upstream position before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear, since damaged wiring can shorten sensor life and affect ECU feedback. Confirm the vehicle application by year, make, model, and sensor position before replacing the original unit.

Quality Assurance

Walker Products has supplied engine management and oxygen sensor components since 1946 and manufactures this part as an OE-style replacement for the listed applications. The brand operates under Automotive ISO9001/TS 16949 quality systems.