Walker 350-64009 Oxygen Sensor - Upstream

Walker 350-64009 Oxygen Sensor for Honda Civic and Acura CSX

Walker Products 350-64009 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for select Honda Civic and Acura CSX applications. It is built to provide the ECU with the 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 applications
• 4-wire configuration with female connector
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon connector shape for application-specific fitment
• 14.29 in. wiring harness length and 17.83 in. overall length

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors developed for direct replacement use. Part number 350-64009 is designed for upstream placement and is listed for 2006-2011 Acura CSX and 2009-2011 Honda Civic applications, including Bank 1 Sensor 1 and front oxygen sensor positions. If your vehicle is showing an oxygen sensor fault, this sensor is built to restore the signal the ECU uses to manage air-fuel ratio and emissions performance.

Walker Products has supplied engine management and fuel system components since 1946 and manufactures to automotive ISO 9001 / TS 16949 standards. This part cross-references Bosch 15733 and Denso 234-9005 for the same application.

Vehicle Fitment

• Fits 2006-2011 Acura CSX, upstream
• Fits 2006-2011 Acura CSX, upstream, Bank 1 Sensor 1 needs an upstream oxygen sensor
• Fits 2006-2011 Acura CSX, upstream, front oxygen sensor compatible with various vehicle models
• Fits 2009-2011 Honda Civic, upstream
• Fits 2009-2011 Honda Civic, upstream, Bank 1 Sensor 1 needs an upstream oxygen sensor
• Fits 2009-2011 Honda Civic, upstream, front oxygen sensor compatible with various vehicle models

Common Issues This Sensor May Address

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

Installation Notes

Before installation, inspect the sensor wiring harness and connector for heat damage, corrosion, or abrasion. Confirm upstream placement, thread size, connector style, and harness length against the original part before replacement. Clear stored fault codes after installation and verify that the ECU reads the new sensor correctly.

Quality Assurance

Walker Products manufactures this oxygen sensor as a specific-application replacement and backs its engine management components with ISO 9001 / TS 16949 certified production practices.