Walker 350-34580 Oxygen Sensor - Upstream

Walker 350-34580 Oxygen Sensor Overview

Walker Products 350-34580 is a heated oxygen sensor built as a specific-fit OE replacement for select upstream applications. It is engineered to provide the ECU with the exhaust feedback needed for fuel control and emissions monitoring on covered vehicles, including 1990-1992 Geo Prizm and 1990-1991 Toyota Corolla applications.

Key Features

• Heated oxygen sensor for faster operating temperature and signal response
• Specific-fit design for the listed upstream Bank 1 Sensor 1 applications
• 4-wire configuration with a 20-gauge harness
• Radiused polygon male connector for application-specific connection
• 18.0 mm thread diameter with flange mount design
• Overall length: 9.96 in.; wiring harness length: 6.42 in.

Product Details

Walker Products Aftermarket 350-34580 is part of the Walker Products Engine Management line, which focuses on oxygen and air-fuel sensors built for OE-style replacement use. This sensor is manufactured for the specified fitment position and is intended to deliver the diagnostic feedback required by the vehicle ECU. For covered vehicles, it is an upstream oxygen sensor for Bank 1 Sensor 1 service on non-California emissions configurations.

Fits 1990-1992 Geo Prizm, upstream. Fits 1990-1991 Toyota Corolla, upstream. This part cross-references no listed interchange numbers in the provided data.

Common Issues This Sensor Can Address

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

Installation Notes

Confirm the vehicle is a non-California emissions application before ordering. Verify the upstream Bank 1 Sensor 1 location, connector shape, thread size, and harness length against the original part before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life and affect signal quality.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 certification standards. The Walker Products Aftermarket line has been serving engine management and fuel system applications since 1946.