Denso 234-4106 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Denso OE Style Oxygen Sensor 234-4106

Denso 234-4106 is an OE Style heated oxygen sensor built for direct replacement on select Ford, Mazda, and Mercury applications. It is engineered for exact fitment, stable signal output, and reliable exhaust monitoring on vehicles such as the Ford Fusion, Ford Escape, and Mercury Milan.

Key Features

• Heated oxygen sensor for faster operating temperature and consistent feedback
• Specific fit design for direct replacement installation
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• 10.63 in. wiring harness length for OE-style routing
• Built to OE standards with Denso’s aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination

OE Style Construction

Denso’s OE Style line is built to match original equipment dimensions and performance targets for a first-time fit. The sensor is precision manufactured and tested for direct replacement use, helping maintain accurate air-fuel ratio feedback for engine management systems. This Denso oxygen sensor is a practical choice for drivers servicing emissions-related faults on Ford Fusion, Ford Escape, and Mercury Milan applications.

This part cross-references Motorcraft DY1045 for the same application.

Vehicle Fitment

• Fits 2010 Ford F-250 Super Duty, upstream.
• Fits 2010 Ford F-350 Super Duty, upstream.
• Fits 2009 Ford Escape, upstream.
• Fits 2008-2009 Ford F-250 Super Duty, upstream, USA Built; OE Style.
• Fits 2008-2009 Ford F-350 Super Duty, upstream, USA Built; OE Style.
• Fits 2008-2009 Ford Fusion, upstream left, OE Style.
• Fits 2008-2009 Ford Fusion, upstream right, OE Style.
• Fits 2009 Mazda Tribute, upstream.
• Fits 2009 Mercury Mariner, upstream.
• Fits 2008-2009 Mercury Milan, upstream left, OE Style.
• Fits 2008-2009 Mercury Milan, upstream right, OE Style.
• Fits 2007 Ford Fusion, upstream, From 09/04/06; OE Style.
• Fits 2007 Ford Fusion, upstream, OE Style.
• Fits 2007 Mercury Milan, upstream, From 09/04/06; OE Style.
• Fits 2007 Mercury Milan, upstream, OE Style.

Common Replacement Uses

• Check engine light related to oxygen sensor performance
• Incorrect fuel trim or air-fuel ratio readings
• Slow sensor response during closed-loop operation
• Emissions test failures tied to upstream sensor faults
• Rough idle or reduced fuel economy caused by inaccurate exhaust feedback

Installation Notes

Verify connector style, thread size, and upstream position before installation. This sensor uses a threaded mounting design and a 4-wire male connector, so matching the original harness routing and connector orientation is important for proper installation. Confirm the exact vehicle application for Ford Fusion, Ford Escape, Mercury Milan, and related fitments before replacing the sensor.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for direct replacement use. The design focuses on accurate fit, dependable signal performance, and protection of the sensing element for long-term service.