Denso 234-5701 Air / Fuel Ratio Sensor - Upstream Right

Denso OE Style Air/Fuel Ratio Sensor 234-5701

Denso 234-5701 is a heated air/fuel ratio sensor built to OE-style specifications for direct replacement on select Volvo applications. It is engineered for a specific fit and precise signal control, helping maintain accurate fuel mixture feedback in the exhaust stream.

For drivers searching for a Volvo S80 upstream right air/fuel ratio sensor or a Volvo XC90 upstream right oxygen sensor replacement, this Denso OE Style part is built for the correct application and connector layout. The 234-5701 is designed for exact replacement fitment on the listed vehicles.

Key Features

• Heated air/fuel ratio sensor for faster operating readiness
• Specific fit design for direct replacement installation
• 5-wire configuration with male connector
• Wiring harness length: 40.55
• Thread diameter: 0.711
• OE Style line focused on replacement fit and factory-style application matching

OE Style Replacement Details

Denso’s OE Style line is built around exact replacement fitment and application-specific engineering. The 234-5701 follows that approach with a precision-built sensor body, harness length, and connector configuration intended to match the original equipment layout on the listed Volvo models. This helps simplify selection when replacing an upstream right sensor on a 2002-2005 Volvo S80 or a 2003-2005 Volvo XC90.

This part cross-references Volvo (e.g., 8670278, 30637519) for the same application.

Common Issues This Sensor May Address

• Check engine light related to air/fuel ratio sensor performance
• Incorrect fuel mixture feedback from the upstream right sensor location
• Rough idle caused by inaccurate exhaust oxygen sensing
• Reduced fuel control response from a worn heated sensor
• Failed emissions testing tied to sensor signal faults

Installation Notes and Tips

Fits 2002-2005 Volvo S80, upstream right. Fits 2003-2005 Volvo XC90, upstream right. Confirm the connector style, wire count, and thread diameter before installation. Because this is a specific-fit sensor, matching the original sensor location and harness routing is important for proper installation. Always verify the upstream right position on the vehicle before ordering or replacing the part.

Quality Assurance

Denso manufactures and tests these sensors to OE standards, with attention to first-time fit and application accuracy. The 234-5701 is built as a direct replacement part for the listed Volvo fitments, including Volvo S80 and Volvo XC90 upstream right applications.