Walker 350-34402 Oxygen Sensor

Walker 350-34402 Oxygen Sensor for Toyota and Lexus

Walker 350-34402 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 proper fuel control and emissions monitoring on downstream and upstream positions where listed.

Key Features

• Heated oxygen sensor with 4-wire design
• Specific-fit application for listed Toyota and Lexus vehicles
• Flange mount design with 18.0 mm thread diameter
• Radiused polygon male connector for vehicle-specific connection
• 13.7 in. wiring harness length and 17.24 in. overall length
• Walker Products Aftermarket line for engine management and oxygen sensor replacement

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors developed as OE-style replacements for worldwide vehicle applications. Part number 350-34402 is built for the specified fitment position and is intended to restore the diagnostic feedback the ECU expects from the sensor circuit. This matters on vehicles such as the Toyota 4Runner, Toyota Tacoma, Toyota Tundra, Toyota Land Cruiser, Lexus LX470, and Toyota Sequoia where correct upstream or downstream placement is critical to emissions system operation.

Walker Products has supplied engine management and fuel system components since 1946 and manufactures to automotive ISO 9001/TS 16949 standards. This part cross-references common OE-style oxygen sensor applications for the same vehicle platforms.

What It Helps Address

• Check engine light or MIL illumination related to oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel correction
• Elevated exhaust emissions from a worn sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes

Verify the exact year, make, model, and sensor position before ordering. This part is listed for specific upstream and downstream locations, including right and left side applications where noted. Inspect the sensor wiring harness and connector for damage before installation, since damaged wiring can shorten sensor life and affect operation. Confirm thread size, connector shape, and mounting style against the original part.

Quality Assurance

Walker Products manufactures this oxygen sensor as an OE replacement under its aftermarket engine management program. The brand states that its products are built for specific applications and supported by automotive ISO 9001/TS 16949 quality systems.