Walker 350-34420 Oxygen Sensor - Upstream

Walker 350-34420 Oxygen Sensor Overview

Walker Products 350-34420 is a heated oxygen sensor built as a direct OE-style replacement for specific vehicle applications. It is engineered for the correct fitment position and ECU feedback, helping maintain accurate air-fuel monitoring in vehicles such as Honda Civic and Toyota Corolla applications where the proper sensor signal matters.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for precise replacement needs. The 350-34420 follows that approach with a specific-fit design, a threaded mount, a 4-wire heated configuration, and a radiused polygon male connector for application-specific installation.

Key Features

• Heated oxygen sensor for ECU feedback and emissions monitoring
• Specific-fit design for application-matched replacement
• 4-wire configuration with 20-gauge wiring
• 45.79 in. wiring harness length and 49.33 in. overall length
• 18.0 mm thread diameter with threaded mounting type
• Radiused polygon male connector for vehicle-specific connection

Detailed Product Description

The Walker 350-34420 oxygen sensor is manufactured for the intended application and fitment position, making it a practical replacement when the original sensor has aged or failed. As a heated sensor, it is designed to reach operating temperature quickly so the ECU can receive the feedback needed for fuel control and emissions management. This part number is commonly searched by drivers looking for an oxygen sensor replacement for Honda Civic or Toyota Corolla service work, especially when diagnosing drivability or emissions faults.

Walker Products has supplied engine management components since 1946, and the Walker Products Aftermarket line is centered on replacement sensors built for vehicle-specific use. If you are replacing a faulty oxygen sensor on a Honda Civic, Toyota Corolla, or another listed application, part number 350-34420 provides the correct connector style, thread size, and harness layout for the intended installation point.

What It Can Help Resolve

• Check engine light related to oxygen sensor performance
• Rough running caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate sensor readings
• Higher exhaust emissions from poor mixture control
• Fault codes stored in the ECU for sensor circuit or response issues

Installation Notes and Tips

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals. Confirm the threaded mounting location, connector shape, and harness length match the original part before installation. Because this is a specific-fit oxygen sensor, verify the vehicle application and position carefully; for example, fitment searches for Honda Civic and Toyota Corolla should be matched to the exact sensor location on the vehicle.

Use the part number 350-34420 to confirm the correct replacement during ordering and diagnosis. If the original sensor failed due to wiring or connector damage, inspect those related components as well so the new sensor can operate as intended.

Quality Assurance

Walker Products manufactures engine management sensors under ISO 9001 and TS 16949 quality systems. The 350-34420 is built as an OE replacement oxygen sensor for specific applications, with fitment and connector details matched to the intended vehicle use.