Walker 250-54037 Oxygen Sensor

Walker Products OE Oxygen Sensor 250-54037

Walker Products OE 250-54037 is a heated oxygen sensor built for specific upstream applications on select Nissan, INFINITI, and Suzuki vehicles. It is engineered as an OE-style replacement to deliver the exhaust feedback the ECU uses for fuel control and emissions monitoring.

For drivers diagnosing a check engine light, poor fuel economy, or elevated emissions, this Walker oxygen sensor provides a direct-fit solution for the correct mounting position and vehicle application.

Key Features

• Heated oxygen sensor for faster operating temperature and signal response
• Specific-fit design for the listed upstream positions
• 4-wire configuration with 20-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for OE-style connection
• Wiring harness length: 13.31 in.; overall length: 16.85 in.

Product Details

Walker Products OE focuses on original-equipment replacement sensors and engine management components. Part number 250-54037 is manufactured for the specified application and position so the ECU receives the correct diagnostic feedback from the exhaust stream. This matters on vehicles such as the Nissan Altima, Nissan Pathfinder, and Nissan Armada, where upstream sensor data is used to manage air-fuel ratio and emissions performance.

This part cross-references Bosch (e.g., 15733) for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Rough running or inconsistent fuel delivery caused by inaccurate exhaust feedback
• Reduced fuel economy from a sensor that is no longer reporting correctly
• Higher exhaust emissions from delayed or incorrect air-fuel correction
• Fault codes stored in the ECU for Bank 1 Sensor 1 or upstream sensor circuits

Installation Notes

Install only in the listed upstream positions for the exact vehicle and emissions configuration. Confirm connector shape, thread size, harness length, and wire count before installation. Inspect the sensor wiring, connector, and nearby exhaust components for heat damage or physical wear, since damaged harnesses can shorten sensor life and affect signal quality.

Fitment includes 2007-2012 Nissan Pathfinder, 2008-2012 Nissan Armada, 2009-2011 Nissan Altima, 2008-2010 Nissan Xterra, 2008-2010 INFINITI QX56, 2009-2010 Nissan Frontier, 2009-2011 Nissan Versa, 2010 Nissan Rogue, 2009-2010 Suzuki Equator, 2011-2012 Nissan Sentra, 2009 Nissan Maxima, and related upstream right, upstream left, and upstream front applications listed for the exact model and emissions setup.

Quality Assurance

Walker Products OE sensors are developed as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, Walker Products has supplied engine management and fuel system components for a wide range of vehicle applications.