Walker 250-54040 Oxygen Sensor - Upstream

OE Oxygen Sensor for Acura and Honda

Walker Products OE 250-54040 is a heated, specific-fit oxygen sensor built for upstream applications on select Acura CSX and Honda Civic models. It is engineered to deliver the ECU feedback needed for accurate fuel control and emissions monitoring.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed upstream position
• 4-wire configuration with female connector
• Threaded mounting with 18.0 mm thread diameter
• 14.29 in. wiring harness length and 17.83 in. overall length
• Walker Products OE line for application-specific engine management replacement parts

Detailed Description

Walker Products OE 250-54040 is an upstream oxygen sensor designed for direct replacement in vehicles that require precise exhaust feedback to the engine control unit. The heated sensor design helps the system reach operating temperature quickly, supporting stable air-fuel management during normal driving and cold starts. This part number is built for the specified fitment position and is intended for 2006-2011 Acura CSX and 2009-2011 Honda Civic applications listed below.

The Walker Products OE product line focuses on application-specific engine management components, including oxygen and air-fuel sensors developed to match original equipment requirements. For shoppers searching for an upstream oxygen sensor for 2009-2011 Honda Civic or a replacement oxygen sensor for 2006-2011 Acura CSX, part number 250-54040 provides the correct threaded, heated, 4-wire configuration for the listed vehicles.

Vehicle Fitment

• Fits 2006-2011 Acura CSX, Upstream
• Fits 2009-2011 Honda Civic, Upstream

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine running caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel correction
• Elevated exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU for sensor-related issues

Installation Notes and Tips

Confirm the connector shape, wire count, thread diameter, and mounting position before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear, since damaged wiring can shorten sensor life and affect readings. Verify that the vehicle requires an upstream oxygen sensor before ordering, and compare the original part location to the listed fitment for Acura CSX and Honda Civic models.

Quality Assurance

Walker Products has produced engine management components since 1946 and manufactures OE-style replacement sensors for specific vehicle applications. The brand operates under Automotive ISO9001/TS 16949 certification, with a focus on application-matched fitment and ECU feedback requirements.