Walker 350-34642 Oxygen Sensor - Downstream or Upstream

Walker 350-34642 Oxygen Sensor Overview

Walker Products 350-34642 is a heated oxygen sensor built as a specific-fit OE replacement for select Toyota applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance on the vehicles listed below.

Compatible With Toyota Pickup downstream California-ESV short bed applications and Toyota Van upstream applications, this oxygen sensor is a direct-fit solution for targeted repair work on 1988-1991 Toyota models.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed Toyota applications
• 4-wire configuration with female connector
• Radiused polygon connector shape for application-specific fitment
• 18.0 mm thread diameter and flange mount design
• 20.39 in. wiring harness length and 23.94 in. overall length
• Walker Products Aftermarket line for engine management and oxygen/air-fuel sensor replacement

Detailed Description

Walker Products 350-34642 is part of the Walker Products Aftermarket engine management sensor line, developed as an OE-style replacement for vehicles that require precise sensor placement and ECU feedback. This heated oxygen sensor is built for specific fitment and is listed for 1989-1991 Toyota Pickup downstream California-ESV short bed applications, as well as 1988-1989 Toyota Van upstream applications. If you are replacing a failed Toyota Pickup downstream oxygen sensor or a Toyota Van front oxygen sensor, this part number provides the application-specific configuration needed for service.

Walker Products has long focused on engine management and oxygen/air-fuel sensors for replacement use, with manufacturing centered on application accuracy and diagnostic signal performance. Part number 350-34642 is referenced for Toyota Pickup and Toyota Van service where the ECU relies on correct sensor input to manage fuel delivery and emissions monitoring.

What This Sensor Helps Address

• Check engine light related to oxygen sensor fault codes
• Rough engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from a failing upstream or downstream sensor
• Elevated exhaust emissions from inaccurate sensor readings
• Sensor-related drivability issues on Toyota Pickup and Toyota Van models

Installation Notes and Tips

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear. Confirm the mounting style, thread diameter, connector shape, and sensor position against the vehicle service information before installation. For fitment, use the listed application exactly: Fits 1989-1991 Toyota Pickup, downstream; Fits 1988-1989 Toyota Van, upstream. Part number 350-34642 should be matched to the correct sensor location so the ECU receives the expected signal.

Quality Assurance

Walker Products manufactures engine management sensors under ISO 9001/TS 16949 quality systems and has supplied replacement fuel system and sensor components since 1946. The Walker Products Aftermarket line is built around application-specific replacement parts for OE-style service on the listed Toyota vehicles.