Walker 350-34430 Oxygen Sensor - Downstream or Upstream

Walker 350-34430 Oxygen Sensor for Toyota

Walker Products 350-34430 is a heated oxygen sensor built as a specific-fit OE replacement for select Toyota Land Cruiser and Toyota Pickup applications. It is engineered to provide the ECU with the exhaust feedback needed for proper fuel control and emissions monitoring.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed Toyota applications
• 4-wire configuration with 20-gauge wiring
• 17.24 in. wiring harness length and 20.79 in. overall length
• 18.0 mm thread diameter with flange mount design
• Radiused polygon male connector for application-specific connection

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as OE-style replacements for worldwide vehicle coverage. Part number 350-34430 is built for the correct fitment position and diagnostic feedback expected by the vehicle ECU. For Toyota Land Cruiser and Toyota Pickup models, this sensor supports accurate exhaust monitoring on upstream and downstream locations where listed.

Compatible With Toyota Land Cruiser and Toyota Pickup applications, this sensor is listed for 1995 Toyota Land Cruiser upstream and downstream positions, 1993-1994 Toyota Land Cruiser upstream positions, and 1992-1993 Toyota Pickup upstream California emissions vehicles. This part number, 350-34430, is also referenced for Land Cruiser cylinder-specific upstream applications noted in the fitment data.

Common Issues It May Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel control
• Higher exhaust emissions from a failing sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

Before replacement, inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion. Confirm the mounting style, thread diameter, connector shape, wire count, and sensor position match the vehicle listing before installation. For Toyota Land Cruiser and Toyota Pickup fitments, verify whether the application calls for upstream or downstream placement and confirm the exact model year and emissions configuration.

Quality Assurance

Walker Products states that its engine management sensors are manufactured under Automotive ISO9001/TS 16949 quality systems and developed for OE replacement use. Since 1946, Walker Products has supplied engine management and fuel system components for vehicle applications worldwide.