Walker 350-34629 Oxygen Sensor - Upstream

Walker 350-34629 Oxygen Sensor for Toyota

Walker Products 350-34629 is a heated oxygen sensor built as a specific-fit OE-style replacement for select Toyota applications. It is engineered to deliver the ECU feedback needed for accurate fuel control and emissions monitoring on 1988-1989 Toyota 4Runner and 1988 Toyota Pickup upstream positions.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fitment for the correct vehicle application and mounting position
• 4-wire design with a female radiused polygon connector
• 29.06 in. wiring harness length and 20-gauge wire
• 18.0 mm thread diameter with flange mount design
• Overall length: 32.6 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for OE replacement use. Part number 350-34629 is built for upstream installation on select Toyota 4Runner and Toyota Pickup models, including Bank 1 Sensor 1 applications where listed. The heated sensor design helps the ECU monitor exhaust oxygen content so the engine management system can maintain proper air-fuel control and emissions performance.

Walker Products 350-34629 is a direct-fit solution for drivers servicing a 1988-1989 Toyota 4Runner upstream oxygen sensor or a 1988 Toyota Pickup upstream oxygen sensor. The specific-fit construction helps ensure the connector, harness length, and mounting style match the intended application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel correction
• Elevated exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU tied to the affected sensor circuit

Installation Notes

Verify the vehicle’s upstream sensor location before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or abrasion, since physical damage can shorten service life. Confirm thread diameter, connector shape, and harness length match the original part before fitting. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Quality Assurance

Walker Products has supplied engine management components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-34629 oxygen sensor is manufactured for the specified application and position to support proper ECU feedback on the listed Toyota vehicles.