Denso 234-9123 Air / Fuel Ratio Sensor - Upstream

Denso OE Style Air/Fuel Ratio Sensor

This Denso OE Style air/fuel ratio sensor is built for direct replacement on specific Subaru and Saab applications. Part number 234-9123 is a heated, 4-wire sensor with a 19.69 in. wiring harness length for a precise OE-style fit.

Key Features

• Heated air/fuel ratio sensor for faster operating readiness
• Specific fit design for direct replacement on listed vehicles
• 4-wire configuration for the correct electrical interface
• 19.69 in. wiring harness length for application-specific routing
• OE Style construction for factory-like fit and function
• Manufactured and tested to OE standards for consistent replacement quality

Detailed Description

Denso OE Style part number 234-9123 is engineered as a direct replacement air/fuel ratio sensor for select Subaru Impreza, Forester, Legacy, and Outback models, plus the 2006 Saab 9-2X. It is a heated, specific-fit sensor built to match the original application requirements, helping maintain accurate exhaust feedback for the engine management system. This part cross-references Subaru 22641AA36A and 22641AA360 for the same application.

The OE Style product line focuses on exact replacement fitment and consistent sensor performance. For buyers searching for a Subaru Impreza upstream air/fuel ratio sensor or a Subaru Forester upstream oxygen sensor replacement, Denso 234-9123 provides an application-specific solution with the correct harness length and wire count.

What It Helps Address

• Check engine light related to air/fuel ratio sensor performance
• Rough idle caused by inaccurate exhaust feedback
• Fuel trim issues from a slow or failing upstream sensor
• Emissions test failures tied to sensor response problems
• Driveability concerns on Subaru Impreza, Forester, Legacy, Outback, and Saab 9-2X applications

Installation Notes and Tips

• Fits 2006-2011 Subaru Impreza, Upstream, OE Style
• Fits 2006-2010 Subaru Forester, Upstream, OE Style
• Fits 2006-2009 Subaru Legacy, Upstream, OE Style
• Fits 2006-2009 Subaru Outback, Upstream, OE Style
• Fits 2006 Saab 9-2X, Upstream, OE Style

Confirm the upstream sensor location before installation and compare the connector, harness routing, and wire count to the original part. Denso 234-9123 is a specific-fit replacement, so matching the vehicle application is important for proper installation.

Quality Assurance

Denso manufactures and tests this sensor to OE standards, with precision-built components intended to match the original replacement fit. The OE Style line is focused on first-time fitment and application accuracy for direct replacement service.