Walker 250-21033 Oxygen Sensor - Upstream

Walker OE Oxygen Sensor for Honda Civic

Walker Products OE 250-21033 is a specific-fit oxygen sensor engineered for upstream placement and ECU feedback on select Honda Civic applications. It is built for 1984-1987 Honda Civic, upstream service, including Bank 1 Sensor 1 needs an upstream oxygen sensor and front oxygen sensor applications listed for this vehicle family.

Key Features

• Specific-fit oxygen sensor for upstream installation
• Non-heated sensor design
• 18.0 mm thread diameter with threaded mounting
• Radiused polygon female connector
• 22.36 in. wiring harness length
• 20-gauge wire with 1-wire configuration
• Overall length: 25.91 in.
• Walker Products OE part number 250-21033

Product Details

Walker Products OE focuses on original-equipment-style engine management and oxygen/air-fuel sensors for precise application matching. Part number 250-21033 is made for the correct fitment position and is intended to provide the diagnostic feedback the ECU expects from the upstream sensor location. For 1984-1987 Honda Civic, this oxygen sensor supports the vehicle’s emissions monitoring system and helps restore proper sensor input when the original unit is worn or failing. The Walker Products OE line is built around application-specific replacement parts for a wide range of vehicles, and 250-21033 follows that approach with the connector style, thread size, and harness length matched to the listed application. If you are searching for a 1984-1987 Honda Civic upstream oxygen sensor or a Walker Products OE 250-21033 replacement, this part is listed for that service position.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Poor engine performance caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel data
• Higher exhaust emissions from a failing sensor
• Stored ECU fault codes tied to the oxygen sensor circuit

Installation Notes

Verify the connector shape, thread diameter, and harness routing before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear, since damaged wiring can shorten sensor life and affect ECU feedback. This part is listed for threaded, upstream mounting on the specified Honda Civic applications, so confirm the vehicle’s sensor location before replacement. For search accuracy, this is the Walker Products OE 250-21033 oxygen sensor for 1984-1987 Honda Civic upstream service.

Quality Assurance

Walker Products states that its engine management and oxygen sensor lines are developed as OE replacement parts and manufactured under ISO 9001/TS 16949 quality systems. Since 1946, the brand has supplied engine management sensors and fuel system components for vehicle applications worldwide.