Walker 350-31007 Oxygen Sensor - Upstream

Walker 350-31007 Oxygen Sensor for Toyota Upstream Applications

Walker 350-31007 is a specific-fit oxygen sensor engineered as an OE-style replacement for select Toyota upstream applications. It is built for vehicles that rely on accurate exhaust feedback to help the ECU manage fuel delivery and emissions performance.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment. The 350-31007 follows that approach with the correct mounting style, connector design, and sensor configuration for the listed Toyota models.

Key Features

• Specific-fit oxygen sensor for upstream placement
• Non-heated sensor design
• Flange mount with 18.0 mm thread diameter
• Radiused polygon female connector
• 11.34 in. wiring harness length with 20-gauge wire
• Overall length: 14.88 in.
• Walker Products Aftermarket part number 350-31007

Detailed Description

This oxygen sensor is designed for select Toyota Camry, Celica, Corolla, Cressida, 4Runner, Pickup, Supra, Tercel, Van, Corona, and Starlet applications with upstream placement. It is a direct-fit replacement for vehicles that require a non-heated, flange-mounted sensor with the correct connector and harness layout for ECU feedback.

Accurate oxygen sensor operation is important for maintaining proper air-fuel control. When a sensor begins to fail, drivers may notice poor engine performance, higher fuel consumption, increased exhaust emissions, or a malfunction indicator light. The sensor, wiring harness, and connector should also be inspected for damage during diagnosis. Part number 350-31007 is built to match the specified application and position requirements for these Toyota models.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What This Sensor Helps Address

• Check engine light related to upstream oxygen sensor faults
• Rich or lean fuel mixture concerns
• Reduced fuel economy from inaccurate exhaust feedback
• Elevated exhaust emissions
• Poor drivability caused by a failing sensor signal

Installation Notes and Tips

• Confirm upstream position and emissions configuration before ordering.
• Verify connector shape, thread diameter, and harness length against the original sensor.
• Inspect the connector and wiring for heat damage, corrosion, or abrasion before installation.
• Use the vehicle’s ECU fault codes and service information to confirm the failed circuit or sensor.
• For Toyota Camry, Toyota Celica, and Toyota Corolla applications, match the listed year range and emissions notes exactly.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures this sensor as an application-specific replacement. The company is ISO 9001/TS 16949 certified, supporting consistent production and fitment control for the listed Toyota upstream oxygen sensor applications.