Walker 250-54081 Oxygen Sensor - Upstream

Walker OE Oxygen Sensor for Mazda 2

Walker Products OE oxygen sensor Part Number 250-54081 is a direct-fit, heated sensor built for specific vehicle applications. It is engineered to deliver the ECU feedback needed for accurate air-fuel control on the 2011-2017 Mazda 2, upstream position.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the correct mounting position
• 4-wire configuration with female connector
• Threaded mounting type with 18.0 mm thread diameter
• 21.18 in. wiring harness length and 24.72 in. overall length
• Radiused polygon connector shape for application-specific fitment

Product Details

Walker Products OE line focuses on engine management sensors built as OE replacement parts for defined applications. This oxygen sensor is made for upstream placement and is intended to provide the diagnostic feedback the ECU expects on vehicles such as the Mazda 2. Part Number 250-54081 is a practical choice when replacing a worn sensor that has affected fuel control, emissions performance, or fault-code monitoring.

Fits 2011-2017 Mazda 2, upstream. Fits 2011-2017 Mazda 2, upstream. 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 feedback
• Rough engine operation caused by inaccurate sensor readings
• Elevated exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the sensor circuit

Installation Notes and Tips

Confirm the upstream location before installation and verify connector shape, wire count, and thread size against the original part. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement. For best results, clear diagnostic trouble codes after installation and confirm the repair with a scan tool.

Quality Assurance

Walker Products OE sensors are developed as original-equipment replacement parts for defined applications and manufactured under ISO 9001/TS 16949 quality systems. Since 1946, Walker Products has supplied engine management and fuel system components for vehicle service needs.