Walker 350-34608 Oxygen Sensor - Upstream

Walker 350-34608 Oxygen Sensor Overview

Walker Products 350-34608 is a specific-fit heated oxygen sensor for upstream applications on select Toyota Supra models. It is engineered as an OE-style replacement that provides the ECU with the feedback needed for fuel control and emissions monitoring.

Compatible with 1989-1992 Toyota Supra, upstream, including California emissions vehicles.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• Specific-fit design for the correct application and mounting position
• 4-wire configuration with female connector
• 29.84 in. wiring harness length and 20-gauge wire
• 18.0 mm thread diameter with flange mount design
• Overall length: 33.39 in.

Application Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for direct replacement use. Part number 350-34608 is matched to the upstream location on 1989-1992 Toyota Supra models and is listed for California emissions vehicles. This sensor is intended to restore accurate exhaust feedback to the ECU, which is critical for air-fuel control, emissions performance, and drivability. If the original sensor has aged, the vehicle may show fault codes, run rich or lean, increase fuel use, or trigger the malfunction indicator light. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues This Sensor May Address

• Check engine or malfunction indicator light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough running, hesitation, or unstable idle from incorrect air-fuel correction
• Elevated exhaust emissions from a degraded upstream sensor
• Stored ECU fault codes tied to the sensor circuit or related systems

Installation Notes

Verify the connector shape, wire count, thread diameter, and mounting style before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life. Confirm the vehicle is a 1989-1992 Toyota Supra with upstream oxygen sensor placement and California emissions configuration before ordering.

Quality Assurance

Walker Products has manufactured engine management components since 1946 and operates with ISO 9001/TS 16949 quality systems. Part number 350-34608 is built for the specified application and fitment position to support proper ECU feedback.