Walker 350-31027 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker 350-31027 Oxygen Sensor for OE Replacement

Walker Products 350-31027 is a specific-fit oxygen sensor engineered for direct replacement in a wide range of GM, Pontiac, Buick, Oldsmobile, Isuzu, and Geo applications. It is built for upstream and downstream positions where listed, with vehicle-specific connector and thread details to match the original sensor layout.

Key Features

• Specific-fit oxygen sensor for confirmed vehicle applications
• Non-heated sensor design
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon female connector
• 12.13 in. wiring harness length with 20-gauge wire
• Overall length: 15.67 in.
• Walker Products Aftermarket engine management line

Product Line Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built as OE-style replacements. Part number 350-31027 is application-specific, meaning the sensor position, connector style, and feedback requirements are matched to the listed vehicle fitment.

Detailed Description

Use Walker 350-31027 when replacing a failing oxygen sensor on supported Chevrolet, GMC, Pontiac, Buick, Oldsmobile, Isuzu, and Geo models. This sensor is listed for multiple upstream applications, including Bank 1 Sensor 1 positions, as well as select downstream and left/right upstream locations. For vehicles such as the Chevrolet S10, Pontiac Grand Am, and Buick Century, correct oxygen sensor operation is important for ECU feedback, fuel control, and emissions monitoring.

This part number, 350-31027, is manufactured for specific fitment rather than universal use. The non-heated design, threaded mount, and connector configuration help ensure the replacement matches the original sensor location and electrical interface on the listed applications.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect air-fuel feedback
• Rough running or hesitation from inaccurate ECU input
• Elevated exhaust emissions from a worn sensor
• Fault codes tied to upstream or downstream sensor circuits

Installation Notes and Tips

Verify the exact year, make, model, and sensor position before installation. Confirm whether the application calls for upstream, downstream, left, or right placement, and check the connector shape, thread diameter, and harness length against the original part. Inspect the wiring harness and connector for damage before replacing the sensor. On affected vehicles, such as Chevrolet Tahoe, Pontiac Grand Am, and GMC Sonoma applications, correct position matching is essential for proper ECU feedback.

Quality Assurance

Walker Products has supplied engine management components since 1946 and operates as an ISO 9001/TS 16949 certified company. The 350-31027 oxygen sensor is produced as an OE-style replacement for the listed applications and is backed by Walker Products’ manufacturing and catalog support standards.

This part cross-references no listed aftermarket part numbers for the same application.