Walker 350-34353 Oxygen Sensor - Downstream or Upstream

Walker 350-34353 Oxygen Sensor Overview

Walker Products 350-34353 is a heated oxygen sensor built as a specific-fit OE replacement for select Toyota and Lexus applications. It is engineered to provide the ECU with the feedback needed for accurate fuel control and emissions monitoring, making it a direct replacement choice for upstream and downstream service where listed.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment. The 350-34353 follows that approach with the correct connector style, wire count, thread size, and mounting configuration for the listed vehicles.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for listed Toyota and Lexus applications
• 4-wire sensor with female connector
• Radiused polygon connector shape
• 18.0 mm thread diameter and flange mount design
• 12.32 in. wiring harness length and 15.87 in. overall length
• 20-gauge wiring for the specified application

Detailed Description

The Walker 350-34353 oxygen sensor is designed for vehicles that rely on precise exhaust feedback to manage air-fuel ratio and emissions performance. As an OE-style replacement, it is built for the specified installation position and vehicle configuration, helping restore proper sensor input to the ECU when the original sensor has aged, failed, or been damaged.

Fits 1990-1992 Toyota Land Cruiser, upstream; 1990-1991 Lexus ES250, upstream; 1988-1991 Toyota Camry, upstream; 1989-1991 Toyota Pickup, upstream or downstream depending on the listed California emissions configuration; 1988-1989 Toyota Celica, upstream; and 1988-1989 Toyota MR2, upstream. This part number, 350-34353, is also listed for additional Toyota Pickup configurations with California ESV notes.

This part cross-references no additional part numbers in the provided data.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture caused by inaccurate exhaust feedback
• Higher fuel consumption from degraded sensor response
• Increased exhaust emissions from faulty sensor readings
• Poor engine operation tied to sensor or connector damage

Installation Notes

Verify the sensor position, emissions configuration, connector shape, and thread size before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear, since damaged wiring can shorten service life and affect ECU feedback. Confirm the vehicle application against the listed fitment for Toyota Land Cruiser, Lexus ES250, Toyota Camry, Toyota Pickup, Toyota Celica, and Toyota MR2 before ordering.

Quality Assurance

Walker Products states that its engine management and oxygen sensor lines are developed as OE replacement parts for worldwide vehicle applications and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, the brand has supplied engine management sensors and fuel system components for automotive service needs.