Walker 350-64027 Oxygen Sensor - Upstream

Walker 350-64027 Oxygen Sensor for Subaru

Walker Products 350-64027 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select Subaru applications. It is built for upstream placement and is matched to the vehicle’s diagnostic feedback requirements, helping the ECU monitor exhaust oxygen levels accurately.

For Subaru Impreza and Subaru WRX/WRX STI models, this Walker Products Aftermarket sensor is a direct-fit solution for the upstream oxygen sensor location. The 4-wire, threaded design uses a male radiused polygon connector and is specified for the listed application fitment.

Key Features

• Part number: 350-64027
• Heated oxygen sensor for upstream placement
• Specific-fit design for listed Subaru applications
• 4-wire configuration with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 29.06 in.
• Overall length: 32.6 in.
• Male connector with radiused polygon shape

Detailed Description

Walker Products Aftermarket oxygen sensors are developed as replacement parts for original equipment applications, with fitment and connector design matched to the vehicle’s sensor location. The 350-64027 is an upstream heated oxygen sensor intended for Subaru models that require precise ECU feedback from the front exhaust stream. This part number 350-64027 is listed for 2008-2014 Subaru Impreza, 2012 Subaru WRX, and 2013-2014 Subaru WRX STI upstream positions, including Bank 1 Sensor 1 applications noted in the fitment data.

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946, and the Walker Products Aftermarket line focuses on application-specific replacement parts for modern diagnostic systems. If your Subaru Impreza, WRX, or WRX STI has an upstream sensor fault, this OE-style replacement is built to restore the signal the ECU expects.

Common Issues This Sensor May Address

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

Installation Notes and Tips

Confirm the vehicle’s year, model, and upstream sensor position before ordering. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since damaged wiring can shorten sensor life and affect readings. Use the listed threaded mounting and connector style to verify proper replacement for Subaru Impreza, WRX, and WRX STI applications.

Quality Assurance

Walker Products is an Automotive ISO 9001/TS 16949 certified company. The 350-64027 is manufactured for the specified application and position to provide the diagnostic feedback required by the ECU.