Walker 350-34435 Oxygen Sensor - Upstream

Walker 350-34435 Oxygen Sensor for Toyota Pickup

Walker 350-34435 is a heated oxygen sensor built as a specific-fit OE replacement for select Toyota applications. It is designed for upstream placement on 1990-1991 Toyota Pickup models with California emissions, helping the ECU receive the feedback it needs for fuel control and emissions monitoring.

Key Features

• Specific-fit oxygen sensor for targeted vehicle application
• Heated sensor design for faster operating temperature
• 4-wire configuration with 20-gauge wiring
• Male connector with radiused polygon shape
• Flange mount design with 18.0 mm thread diameter
• Wiring harness length: 17.44 in.
• Overall length: 20.98 in.

Application Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered as OE-style replacements for a wide range of vehicles. Part number 350-34435 is built for the upstream sensor location on the Toyota Pickup, with fitment listed for 1990-1991 Toyota Pickup California emissions vehicles. If the original sensor is aging or damaged, this Walker 350-34435 replacement helps restore the feedback the ECU uses to manage air-fuel ratio and emissions performance.

This part cross-references no listed interchange part numbers for the same application.

What It Helps Address

• Check engine or malfunction indicator light related to oxygen sensor performance
• Poor engine operation caused by inaccurate exhaust feedback
• Increased fuel consumption from incorrect air-fuel control
• Higher exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU tied to the sensor circuit or related systems

Installation Notes

Confirm the upstream position, connector style, thread diameter, and flange mount before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life. For 1990-1991 Toyota Pickup California emissions applications, verify the original sensor layout and emissions configuration before ordering.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures to ISO 9001/TS 16949 standards. The 350-34435 oxygen sensor is produced as a specific application replacement to match the required fitment position and ECU feedback needs.