Walker 350-34371 Oxygen Sensor - Upstream

Walker Oxygen Sensor for Nissan 200SX

Restore accurate exhaust feedback with this Walker oxygen sensor, part number 350-34371. It is a specific-fit, heated upstream sensor engineered for the 1987-1988 Nissan 200SX and built to deliver the ECU signal needed for proper fuel control and emissions monitoring.

Key Features

• Specific-fit oxygen sensor for the upstream position
• Heated sensor design for faster operating temperature
• 4-wire configuration with male connector
• Threaded mounting with 12.0 mm thread diameter
• Wiring harness length: 43.23 in.; overall length: 46.77 in.
• Walker Products Aftermarket part number 350-34371

Product Details

Walker Products Aftermarket develops engine management and oxygen/air-fuel sensors as OE-style replacements for a wide range of vehicles. This 350-34371 oxygen sensor is built for the upstream location on the 1987-1988 Nissan 200SX, where it helps the engine control unit monitor exhaust oxygen content and adjust air-fuel delivery. The heated design supports quicker sensor activity after startup, while the specific-fit construction helps ensure the correct connector, wire layout, and mounting style for the application. Walker Products has supplied engine management components since 1946, and its sensor line is focused on application-specific fitment and diagnostic feedback for modern ECU systems.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

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

Installation Notes and Tips

Fits 1987-1988 Nissan 200SX, upstream. Confirm the connector shape, wire count, thread diameter, and harness routing before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten sensor life and affect signal quality. Verify the upstream mounting location and clear any diagnostic trouble codes after replacement if required by the vehicle service procedure.

Quality Assurance

Walker Products manufactures this sensor as an application-specific replacement for the listed vehicle fitment. The brand’s sensor program is developed for ECU feedback accuracy and consistent OE-style service replacement.