Walker 350-34009 Oxygen Sensor

Walker 350-34009 Oxygen Sensor Overview

Walker 350-34009 is a heated oxygen sensor built as a specific-fit OE replacement for select Toyota, Lexus, and related applications. It is engineered to provide the ECU with the correct exhaust feedback for downstream and upstream positions, helping maintain proper fuel control and emissions monitoring.

Walker Products Aftermarket focuses on application-specific engine management and oxygen/air-fuel sensors, with fitment matched to the vehicle position and diagnostic requirements. For Toyota Tundra, Toyota Sequoia, Toyota Tacoma, Lexus GS300, Lexus SC300, and Toyota Supra applications, this sensor is built for direct replacement use where the original sensor location and connector style match.

Key Features

• Part number: 350-34009
• Heated oxygen sensor design for faster operating response
• Specific fit for the listed vehicle applications and sensor positions
• Threaded mounting type with 18.0 mm thread diameter
• 4-wire configuration with 20-gauge wiring
• 16.46 in. wiring harness length and 20.0 in. overall length
• Male connector with radiused polygon connector shape
• OE-style replacement for ECU feedback in emissions control systems

Detailed Description

Walker Products 350-34009 is designed for exhaust sensor replacement where accurate downstream or upstream signal feedback is required. The heated sensor design helps it reach operating temperature efficiently, while the specific-fit construction supports the correct installation position on the vehicle. This matters on vehicles such as the Toyota Tundra downstream right oxygen sensor location, Toyota Sequoia downstream right applications, and select Toyota Tacoma downstream bank 1 sensor 2 positions.

This part also fits select Lexus GS300 downstream applications and Lexus SC300, Toyota Supra, and related upstream positions listed in the fitment data. If the original sensor has triggered a malfunction indicator light, caused poor engine operation, increased fuel use, or elevated exhaust emissions, replacing the failed sensor can restore proper ECU feedback. Walker 350-34009 is part of the Walker Products Aftermarket engine management line, developed for OE-style replacement across many vehicle platforms.

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

What It Helps Address

• Check engine or malfunction indicator light related to oxygen sensor performance
• Poor fuel economy caused by incorrect exhaust feedback
• Rough engine operation tied to sensor signal loss
• Elevated exhaust emissions from a failing upstream or downstream sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes

• Confirm the exact year, model, and sensor position before ordering.
• Verify downstream right, downstream front, downstream, or upstream placement against the vehicle listing.
• Inspect the sensor, wiring harness, and connector for heat damage or physical wear before installation.
• Use the threaded mounting point and connector style specified for the application.
• Clear stored fault codes after installation and confirm proper ECU feedback.

Quality Assurance

Walker Products states that its engine management and oxygen/air-fuel sensors are engineered as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 certification standards.