Walker 250-54063 Oxygen Sensor - Upstream

OE Oxygen Sensor for Mazda MX-5

Walker Products OE 250-54063 is a heated upstream oxygen sensor built for specific Mazda applications. It is engineered as an OE-style replacement to deliver the diagnostic feedback the ECU expects, helping maintain proper air-fuel control on the Mazda MX-5 and Mazda MX-5 Miata.

For 2006-2015 Mazda MX-5 and 2006-2008 Mazda MX-5 Miata models, this upstream sensor is a direct-fit option for Bank 1 Sensor 1 service. The Walker Products OE line focuses on application-specific fitment, connector design, and sensor output for modern engine management systems.

Key Features

• Part number 250-54063
• Heated oxygen sensor design
• Specific fit for the listed Mazda applications
• Upstream position for Bank 1 Sensor 1 service
• 4-wire configuration with 20-gauge wiring
• Radiused polygon female connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 6.42 in.; overall length: 9.96 in.

Detailed Description

Walker Products OE 250-54063 is designed for vehicles that require an upstream oxygen sensor with the correct connector, harness length, and threaded mounting style. It is a specific-fit replacement for Mazda MX-5 and Mazda MX-5 Miata models, including 2006-2015 Mazda MX-5 upstream and 2006-2008 Mazda MX-5 Miata upstream applications. If you are searching for a Mazda MX-5 upstream oxygen sensor, Mazda MX-5 Miata Bank 1 Sensor 1 replacement, or Walker Products 250-54063 for Mazda MX-5, this part matches the listed OE-style application details.

Walker Products OE sensors are developed for engine management systems that rely on accurate exhaust feedback to help the ECU manage fuel delivery and emissions monitoring. The brand’s OE product line is built around application-specific replacement parts for modern vehicles, with attention to fitment position and connector compatibility.

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
• Stored ECU fault codes tied to Bank 1 Sensor 1

Installation Notes and Tips

Confirm the vehicle uses the upstream position before ordering. Inspect the sensor wiring harness and connector for damage before installation, since physical wear can shorten sensor life and affect operation. Verify thread diameter, connector shape, and harness length against the original sensor to ensure proper fit on the Mazda MX-5 or Mazda MX-5 Miata.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an ISO 9001/TS 16949 certified company. The 250-54063 oxygen sensor is manufactured for the specified application and position to support the diagnostic feedback required by the ECU.