Walker 350-34072 Oxygen Sensor - Downstream or Upstream

Walker 350-34072 Oxygen Sensor Overview

Walker Products 350-34072 is a heated oxygen sensor built as a specific-fit OE replacement for select Toyota and Chevrolet applications. It is engineered to provide the ECU with the feedback needed for accurate fuel control, emissions monitoring, and fault detection.

For drivers searching for a Toyota Pickup downstream oxygen sensor, a Toyota Land Cruiser upstream oxygen sensor, or an 1988 Chevrolet Nova upstream oxygen sensor, this Walker Products Aftermarket part number 350-34072 is matched to the listed application and connector style.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed vehicle applications
• 4-wire configuration with 20-gauge wiring
• 6.81 in. wiring harness length
• Radiused polygon female connector
• 18.0 mm thread diameter
• Flange mount design with 10.35 in. overall length

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered as OE-style replacements for a wide range of vehicles. Part number 350-34072 is built for the correct fitment position and diagnostic feedback expected by the vehicle ECU. This matters on newer systems that store fault codes when an oxygen sensor or related circuit is not performing correctly. The sensor is used in applications such as 1990-1992 Toyota Land Cruiser upstream, 1989-1991 Toyota Pickup downstream California-ESV configurations, and 1988 Toyota Corolla upstream, along with 1988 Chevrolet Nova upstream coverage.

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

Common Issues This Sensor May Address

• Check engine light or malfunction indicator light related to oxygen sensor performance
• Rough engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust oxygen readings
• Higher exhaust emissions from a failing sensor circuit
• Stored ECU fault codes tied to the affected sensor or wiring

Installation Notes

Confirm the vehicle year, make, model, and sensor position before ordering. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals before installation. Because this is a specific-fit sensor, verify the flange mount, 18.0 mm thread diameter, and connector shape match the original unit on the vehicle.

Quality Assurance

Walker Products is an Automotive ISO 9001/TS 16949 certified company with a long history in engine management components dating back to 1946. The 350-34072 is manufactured for the listed application to support proper ECU feedback and dependable replacement fitment.