Denso 234-4447 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4447

Denso 234-4447 is an OE-style heated oxygen sensor built for direct replacement on select Subaru applications. It is engineered for a specific fit and uses a threaded mounting design with a 4-wire male connector for straightforward replacement on the correct downstream location.

For Subaru Legacy, Outback, Tribeca, and B9 Tribeca models, this oxygen sensor is designed to match the original configuration and help restore accurate exhaust feedback. The Denso OE Style line focuses on exact replacement fitment and consistent sensor performance.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for the listed Subaru applications
• Threaded mounting type with 0.708 in. thread diameter
• 4-wire construction with male connector
• Wiring harness length: 12.72 in.
• OE Style replacement from Denso, part number 234-4447

Product Details

Denso manufactures this oxygen sensor to OE standards for exact replacement fitment and reliable signal performance. The sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting long service life and stable engine management feedback. This part cross-references Subaru 22690AA68A for the same application.

Compatible With 2008-2014 Subaru Legacy, downstream; 2005-2014 Subaru Outback, downstream; 2008-2014 Subaru Tribeca, downstream; and 2006-2007 Subaru B9 Tribeca, downstream. If you are replacing a downstream oxygen sensor on a Subaru Legacy, Outback, or Tribeca, Denso 234-4447 is built for the original fit and connector layout.

Common Reasons to Replace

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from the downstream sensor
• Reduced fuel economy caused by a failing exhaust sensor
• Slow or inconsistent sensor response during emissions monitoring
• Corrosion, contamination, or wiring damage at the sensor

Installation Notes

Verify the vehicle year, model, and downstream position before ordering. Match the connector style, wire count, and threaded mounting dimensions to the original sensor. Inspect the harness routing and exhaust threads before installation, and confirm the sensor is installed in the correct downstream location for the application.

Quality Assurance

Denso builds this OE Style oxygen sensor to strict original-equipment standards and tests each component for replacement accuracy and fit. The design is intended to deliver the correct part and fit for the listed Subaru applications, including Legacy, Outback, Tribeca, and B9 Tribeca models.