Walker 250-21031 Oxygen Sensor - Upstream

Walker Products OE Oxygen Sensor for Honda Civic

Walker Products OE 250-21031 is a specific-fit oxygen sensor for select Honda Civic applications with an upstream Bank 1 Sensor 1 location. It is built for non-heated operation and uses the correct threaded mounting, connector style, and harness length for the listed vehicles.

Key Features

• Specific-fit oxygen sensor for listed Honda Civic applications
• Upstream, Bank 1 Sensor 1 placement
• Non-heated sensor design
• 18.0 mm thread diameter with threaded mounting
• 15.28 in. wiring harness length
• Single-wire construction with male connector
• Radiused polygon connector shape for application-specific fitment

Product Details

Walker Products OE 250-21031 is engineered as an OE-style replacement oxygen sensor for vehicles that require accurate exhaust feedback to the ECU. For 1992-1995 Honda Civic applications listed here, it serves the upstream sensor position and supports the engine management system by reporting exhaust oxygen content so the ECU can adjust fuel delivery and monitor emissions performance. Walker Products OE focuses on application-specific sensor fitment, and this part number is matched to the listed Civic configurations rather than being universal.

Walker Products OE is the brand line used for original-equipment replacement sensor applications, with parts developed around the vehicle’s required position, connector, and diagnostic feedback needs. The 250-21031 part number is referenced for select Honda Civic upstream oxygen sensor service, including 1992 Honda Civic and 1993-1995 Honda Civic listings shown below.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Rich or lean fuel mixture concerns
• Higher fuel consumption caused by inaccurate exhaust feedback
• Increased exhaust emissions from a failing sensor
• Poor engine operation tied to sensor signal loss

Installation Notes

Verify the vehicle is a non-California emissions application before ordering, since the listed fitment excludes California emissions-certified Civic models. Confirm the upstream Bank 1 Sensor 1 location, connector style, thread diameter, and harness length against the original sensor before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since damaged wiring can shorten sensor life and affect ECU feedback.

• Fits 1992 Honda Civic, upstream
• Fits 1993-1995 Honda Civic, upstream

Quality Assurance

Walker Products manufactures engine management and oxygen/air-fuel sensors as OE replacement parts for global vehicle applications. The company is ISO 9001/TS 16949 certified and has produced engine management components since 1946. Part number 250-21031 is built to match the specified application and diagnostic requirements for the listed Honda Civic fitments.