Denso 234-4403 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Denso OE Style Oxygen Sensor 234-4403

Denso 234-4403 is an OE Style heated oxygen sensor built for direct replacement in select Ford, Mazda, and Lincoln applications. It is engineered for exact fit and stable exhaust feedback, helping maintain proper air-fuel control in vehicles such as the Ford Ranger, Ford Explorer, and Mazda B4000.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit design for direct replacement
• 4-wire configuration with male connector
• Threaded mounting with 0.708 in. thread diameter
• 15.35 in. wiring harness length
• OE Style construction for factory-style fit and function

OE Style Construction

Denso’s OE Style line is built to match original equipment dimensions and connection points for a first-time fit. The sensor uses a precision-built design and Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting consistent exhaust signal quality and long service life. This part cross-references Bosch 13117 and Motorcraft DY847 for the same application.

Fitment

• Fits 2009-2012 Ford E-350 Super Duty, Upstream Left
• Fits 2001-2011 Ford Ranger, Upstream
• Fits 2001-2010 Mazda B4000, Upstream
• Fits 2007-2008 Ford Expedition, Upstream Left
• Fits 2007-2008 Ford Ranger, Upstream Left
• Fits 2008 Lincoln Navigator, Upstream Left
• Fits 2007-2008 Mazda B3000, Upstream Left
• Fits 2007 Lincoln Navigator, Upstream Left
• Fits 2001-2005 Ford Explorer Sport Trac, Upstream
• Fits 2001-2003 Ford Explorer Sport, Upstream
• Fits 1999-2002 Ford Explorer, Upstream
• Fits 1999-2002 Mercury Mountaineer, Upstream
• Fits 1999-2001 Ford Explorer, Upstream Right
• Fits 1999-2001 Mercury Mountaineer, Upstream Right

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle or inconsistent fuel control
• Reduced fuel economy from inaccurate exhaust readings
• Slow sensor response during closed-loop operation
• Failed emissions testing caused by a worn upstream sensor

Installation Notes

Verify the sensor position before ordering, since this part is listed for upstream left, upstream, and upstream right locations depending on application. Confirm connector style, thread size, and harness length against the original sensor on the Ford Ranger, Ford Explorer, or Mazda B4000 before installation. Use the vehicle’s service procedure for proper routing and torque.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for direct-fit replacement performance. The design focuses on accurate fitment, dependable exhaust feedback, and protection of the sensing element for consistent operation in the intended applications.