Denso 234-9122 Air / Fuel Ratio Sensor - Upstream

Denso OE Style Air/Fuel Ratio Sensor

Denso 234-9122 is an OE Style heated air/fuel ratio sensor built for specific-fit replacement on select Subaru and Saab applications. It is engineered for exact fitment and consistent signal performance on upstream locations, including 2004-2005 Subaru Legacy and Outback and 2005 Subaru Forester, Impreza, and Saab 9-2X.

The Denso OE Style line focuses on direct replacement parts that match original equipment fit and function. This sensor uses a 4-wire design with a 21.85-inch wiring harness length for a specific-fit installation.

Key Features

• Part number 234-9122
• Heated air/fuel ratio sensor for upstream placement
• Specific fit for direct replacement applications
• 4-wire configuration
• 21.85-inch wiring harness length
• OE Style product line for replacement fit and function

Detailed Description

Denso 234-9122 is an emission control sensor used to monitor air-fuel mixture data before the catalytic converter. It is a direct replacement for select 2004-2005 Subaru Legacy and Outback applications, plus 2005 Subaru Forester, Impreza, and Saab 9-2X models. This part cross-references Bosch 15586 and NTK 24696 for the same application.

Built to OE standards, this Denso air/fuel ratio sensor is precision-made for first-time fit and consistent installation on the intended upstream location. If you are replacing a worn sensor on a Subaru Legacy, Subaru Outback, Subaru Forester, Subaru Impreza, or Saab 9-2X, 234-9122 provides the correct OE-style replacement format.

What It Helps Address

• Check engine light related to upstream air/fuel sensor performance
• Rough idle caused by inaccurate mixture feedback
• Fuel trim issues from a slow or failing sensor signal
• Emissions test failures tied to sensor response problems
• Poor drivability from incorrect air-fuel ratio data

Installation Notes and Tips

Install this sensor in the upstream position only where listed in the fitment data. Verify connector style, harness routing, and sensor location before installation. Because this is a specific-fit part, compare the original sensor and vehicle application before replacement to confirm the correct OE-style match for your Subaru or Saab model.

Quality Assurance

Denso manufactures and tests this OE Style sensor to strict original-equipment standards. Each component is precision-built for replacement accuracy and first-time fit, supporting dependable installation on the listed Subaru and Saab applications.