Denso 234-4989 Oxygen Sensor - Downstream Right

Denso OE Style Oxygen Sensor for Subaru

The Denso 234-4989 is a specific-fit heated oxygen sensor built for downstream right placement on select Subaru Legacy and Subaru Outback models. It is engineered to match OE-style dimensions and connector requirements for a direct replacement on the listed applications.

Key Features

• Heated oxygen sensor for downstream right location
• Specific fit for listed Subaru applications
• 4-wire design with male connector
• Threaded mounting type with 0.708 in. thread diameter
• 11.61 in. wiring harness length
• OE Style replacement from Denso

OE Style Design and Construction

Denso’s OE Style line is built to the same dimensional and performance expectations used in original equipment service. The 234-4989 is precision-built for exact replacement fitment, helping simplify installation on the correct Subaru Legacy or Subaru Outback application. Denso also uses an aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination, supporting stable sensor operation over time.

This part cross-references NTK 24651 for the same application.

Vehicle Fitment

• Fits 2018-2019 Subaru Legacy, downstream right.
• Fits 2018-2019 Subaru Outback, downstream right.
• Fits 2015-2017 Subaru Legacy, downstream right.
• Fits 2015-2017 Subaru Outback, downstream right.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from a worn downstream sensor
• Reduced fuel economy caused by inaccurate exhaust monitoring
• Slow or inconsistent sensor response in the exhaust system
• OE-style replacement needs for Subaru Legacy and Subaru Outback

Installation Notes and Tips

Confirm the downstream right position before ordering, since this sensor is application-specific. Match the 4-wire male connector, threaded mount, and harness length to the original part on the vehicle. For best results, verify the part number 234-4989 against the vehicle’s year, model, and sensor location before installation.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for fit and performance. The design focuses on first-time fitment and long-term sensor protection, making it a direct replacement choice for the listed Subaru Legacy and Subaru Outback applications.