Walker 250-54064 Oxygen Sensor - Upstream

Walker Products OE Oxygen Sensor for Subaru

Walker Products OE 250-54064 is a heated, specific-fit oxygen sensor engineered for direct replacement in select Subaru applications. It is built to deliver the ECU feedback needed for proper fuel control and emissions monitoring on upstream positions.

For drivers searching for an upstream oxygen sensor for Subaru Impreza, Forester, Legacy, or Outback, this Walker Products OE sensor is matched to the application, connector style, and mounting requirements listed below.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed Subaru upstream applications
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector for application-specific connection
• Threaded mounting with 18.0 mm thread diameter
• Overall length: 11.93 in.; wiring harness length: 8.39 in.
• Walker Products OE 250-54064 for direct replacement service

Product Details

Walker Products OE focuses on OE-style engine management and oxygen sensor replacements built for defined vehicle applications. Part number 250-54064 is a heated upstream oxygen sensor designed to provide the diagnostic signal the ECU expects on the listed Subaru models. This matters for vehicles such as the Subaru Impreza, Subaru Forester, Subaru Legacy, and Subaru Outback when the original sensor is no longer reporting accurately.

Because oxygen sensor performance affects air-fuel control, a failing unit can contribute to poor engine operation, higher fuel use, increased exhaust emissions, or a malfunction indicator light. The sensor, connector, and wiring should also be inspected for damage before replacement. Walker Products OE 250-54064 is built around the specified fitment position and connector layout to simplify replacement on the correct upstream location.

Used For These Issues

• Check engine light related to upstream oxygen sensor faults
• Rough running or inconsistent fuel mixture control
• Increased fuel consumption from inaccurate exhaust feedback
• Elevated exhaust emissions from a degraded sensor signal
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes

Install only in the listed upstream position and verify connector shape, wire count, and thread size before installation. Inspect the harness and connector for heat damage, corrosion, or broken terminals, since those conditions can shorten sensor life and affect signal quality. Confirm the vehicle application by year, make, model, and position before ordering.

Compatible With: 2009-2014 Subaru Impreza, Upstream; 2011-2013 Subaru Forester, Upstream; 2008-2009 Subaru Legacy, Upstream; 2008-2009 Subaru Outback, Upstream. Walker Products OE 250-54064 is also listed for front oxygen sensor replacement on these Subaru applications.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and operates as an ISO 9001 / TS 16949 certified company. The OE product line is developed for application-specific replacement service and consistent ECU feedback on the listed vehicles.