Walker 250-54080 Oxygen Sensor - Upstream

Walker Products OE Oxygen Sensor for Mazda MX-5 Miata

Walker Products OE 250-54080 is a specific-fit heated oxygen sensor engineered for upstream placement and ECU feedback on select Mazda applications. For 2009-2015 Mazda MX-5 Miata upstream oxygen sensor replacement, this part is built around the vehicle’s original sensor location, connector style, and signal requirements.

Key Features

• Specific-fit heated oxygen sensor for upstream installation
• 4-wire design with 20-gauge wiring harness
• Radiused polygon female connector for application-specific fitment
• Threaded mounting with 18.0 mm thread diameter
• Overall length: 9.96 in.; wiring harness length: 6.42 in.
• Walker Products OE part number 250-54080

Product Details

Walker Products OE focuses on original-equipment replacement sensors for vehicle-specific applications, and part number 250-54080 follows that approach for upstream oxygen sensor service. It is a heated sensor designed to provide the diagnostic feedback the ECU expects, helping maintain proper air-fuel control and emissions monitoring on the Mazda MX-5 Miata. This part number 250-54080 is listed for 2009-2015 Mazda MX-5 Miata upstream positions, including Bank 1 Sensor 1 service needs.

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

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 readings
• Higher exhaust emissions from a failing sensor signal
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Confirm the upstream position before ordering, since this sensor is specific to the listed application. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation, and verify the threaded mounting point is clean and undamaged. For Mazda MX-5 Miata oxygen sensor replacement, match the connector shape, wire count, and thread diameter to the original unit to ensure proper fitment.

Quality Assurance

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