Denso 234-9314 Air / Fuel Ratio Sensor - Upstream

Denso OE Style Air/Fuel Ratio Sensor

Denso 234-9314 is an OE Style heated air/fuel ratio sensor built for specific-fit replacement on select Subaru applications. It is engineered and tested to OE standards for accurate signal response and a first-time fit on 2013-2017 Subaru Legacy and 2013-2017 Subaru Outback upstream locations.

The OE Style line focuses on direct replacement parts that match factory fitment and connector requirements, making it a practical choice when servicing Subaru Legacy or Subaru Outback air/fuel ratio sensor faults. Part number 234-9314 is built for the upstream position and uses a 4-wire design with a 14.76-inch wiring harness length.

Key Features

• Heated air/fuel ratio sensor for upstream placement
• Specific fit for direct replacement on listed Subaru applications
• 4-wire configuration for factory-style signal routing
• 14.76-inch wiring harness length
• OE Style construction for exact replacement fit
• Cross-reference: NTK 24851

Detailed Description

Denso 234-9314 is an emission control sensor designed for precise air/fuel monitoring in the exhaust stream. It is a heated, specific-fit sensor intended for 2013-2017 Subaru Legacy upstream and 2013-2017 Subaru Outback upstream applications. The OE Style design supports direct replacement service where factory-style fitment and connector compatibility matter, and the part number 234-9314 is also referenced against Subaru 22641AA66A and 22641AA71A for the same application.

For drivers searching for a 2013-2017 Subaru Legacy upstream air/fuel ratio sensor or a 2013-2017 Subaru Outback upstream oxygen sensor replacement, this Denso unit provides a direct-fit service part built around the original equipment layout.

Common Issues This Part May Address

• Check engine light related to air/fuel ratio sensor performance
• Rough idle caused by inaccurate exhaust mixture feedback
• Fuel trim problems from a failing upstream sensor
• Reduced engine efficiency from delayed sensor response
• Emission control faults tied to the upstream sensor circuit

Installation Notes and Tips

Verify the vehicle year, model, and upstream position before ordering. This sensor is a specific-fit replacement, so connector style, harness length, and wire count should be matched to the original part. For Subaru Legacy and Subaru Outback service, confirm the upstream location on the exhaust system and inspect the connector and wiring path before installation.

Quality Assurance

Denso manufactures and tests this OE Style sensor to strict original-equipment standards for replacement accuracy and fit consistency. The part is built as a direct replacement for the listed Subaru applications and is intended to match factory-style performance requirements.