Denso 234-4739 Oxygen Sensor

Denso OE Style Oxygen Sensor 234-4739

Denso 234-4739 is an OE-style heated oxygen sensor built for direct replacement on select Mitsubishi, Chrysler, and Dodge applications. It is engineered for a specific fit, with a threaded mounting design and a 4-wire male connector for straightforward sensor replacement.

Key Features

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

OE Style Design and Application

Denso’s OE Style line is built to match original equipment dimensions and connection points for a first-time fit. This oxygen sensor is designed for upstream positions on vehicles such as the Mitsubishi Eclipse, Mitsubishi Galant, and Mitsubishi Lancer, helping maintain accurate exhaust feedback for the engine management system. The Denso 234-4739 also cross-references Bosch 15514 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate exhaust gas feedback
• Reduced fuel economy from a failing upstream sensor
• Delayed sensor response during closed-loop operation
• Emissions test failures tied to sensor degradation

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for upstream front, upstream rear, upstream left, upstream right, and upstream applications depending on vehicle. Confirm connector style, thread diameter, and harness length against the original sensor before installation. This part fits 2006-2012 Mitsubishi Eclipse, upstream front; 2004-2009 Mitsubishi Galant, upstream front; and 2002-2007 Mitsubishi Lancer, upstream.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and 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 operation. Fits also include 2004-2008 Mitsubishi Endeavor, upstream front; 2004-2005 Chrysler Sebring, upstream left; and 2004-2005 Dodge Stratus, upstream left.