Walker 350-34322 Oxygen Sensor - Center or Downstream

Walker 350-34322 Oxygen Sensor for Subaru and Mazda

Walker Products 350-34322 is a heated oxygen sensor built as an OE-style replacement for specific downstream applications. It is engineered for direct fitment on select Subaru, Scion, Saab, and Mazda models, with ECU feedback matched to the vehicle’s emissions system requirements.

Key Features

• Heated oxygen sensor for downstream emissions monitoring
• Specific fitment for targeted vehicle applications
• 4-wire design with male connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 25.12 in.; overall length: 28.66 in.
• Radiused polygon connector shape for application-specific connection
• Walker Products Aftermarket line for engine management and oxygen/air-fuel sensors

Product Details

The Walker Products Aftermarket line focuses on engine management sensors built for exact application fitment, and part number 350-34322 follows that approach for downstream oxygen sensor replacement. This sensor is used on vehicles such as the Subaru Impreza, Legacy, Outback, Forester, and Baja, along with the Scion FR-S, Saab 9-2X, and Mazda CX-5 and CX-9 in listed positions. It is a heated, threaded sensor with a 4-wire configuration that supports diagnostic feedback to the ECU on the specified applications.

This part cross-references Walker Products 350-34322 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Elevated exhaust emissions from a failing sensor
• Rough engine operation tied to incorrect ECU sensor input
• Diagnostic trouble codes stored for the affected sensor circuit

Installation Notes and Tips

Verify the exact year, make, model, engine, emissions package, and sensor position before installation. This sensor is listed for downstream use only, including Bank 1 Sensor 2 and select center applications on certain Subaru Legacy and Outback configurations. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement, and confirm the threaded mounting point matches the vehicle specification.

Quality Assurance

Walker Products manufactures engine management and oxygen/air-fuel sensors as OE replacement parts for global vehicle applications. The brand states its products are developed for specific fitment positions and diagnostic feedback requirements, with manufacturing supported by Automotive ISO9001/TS 16949 certification.