Walker 250-54044 Oxygen Sensor - Upstream

Walker OE Oxygen Sensor for Mazda RX-8

Walker Products OE 250-54044 is a heated oxygen sensor built for specific vehicle applications and ECU feedback requirements. It is listed for the 2009-2011 Mazda RX-8 in the upstream position, including Bank 1 Sensor 1 coverage.

Key Features

• Heated oxygen sensor for precise exhaust monitoring
• Specific-fit design for the correct mounting position
• 4-wire configuration with a 20-gauge harness
• Threaded mounting with an 18.0 mm thread diameter
• Radiused polygon male connector for application-specific connection
• Overall length: 24.72 in.; wiring harness length: 21.18 in.

Product Details

Walker Products OE 250-54044 is engineered as an OE-style replacement oxygen sensor for vehicles that rely on accurate exhaust-gas feedback to manage fuel delivery and emissions. For the Mazda RX-8, this upstream sensor helps the ECU monitor air-fuel conditions at the front of the exhaust stream, supporting proper engine management on 2009-2011 models. Walker Products OE focuses on application-specific fitment, so the sensor, connector, and mounting style are matched to the intended position.

The Walker Products OE line is built around replacement parts for engine management and emissions systems, with a long history in sensor and fuel system components. If you are searching for a Walker 250-54044 oxygen sensor for Mazda RX-8 upstream fitment, this part number is the correct OE-style reference for the listed application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel correction
• Elevated exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the sensor circuit or response

Installation Notes

Verify the upstream location before installation and compare the connector, thread size, and harness length to the removed sensor. Inspect the wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten sensor life and affect ECU readings. This part fits 2009-2011 Mazda RX-8, upstream, including Bank 1 Sensor 1 applications.

Quality Assurance

Walker Products states that its engine management and oxygen/air-fuel sensors are developed as original equipment replacement parts and manufactured under ISO 9001/TS 16949 quality systems. Part number 250-54044 reflects that OE-focused approach for the Mazda RX-8 application.