Denso 234-4318 Oxygen Sensor - Downstream Front

Denso OE Style Oxygen Sensor 234-4318

Denso 234-4318 is an OE Style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for the downstream front position on select Mitsubishi Eclipse and Mitsubishi Galant applications, with the correct connector, thread size, and harness length for a direct service replacement.

Key Features

• Heated oxygen sensor for precise exhaust feedback
• Specific-fit design for select Mitsubishi applications
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• 21.26 in. wiring harness length for proper routing
• OE Style replacement built to Denso manufacturing standards

OE Style Design and Fitment

The OE Style product line focuses on direct replacement parts that match original equipment fit and function. This Denso oxygen sensor is precision built to replace the factory unit on 2006-2012 Mitsubishi Eclipse, downstream front, and 2007-2009 Mitsubishi Galant, downstream front. The Denso 234-4318 uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable sensor performance and long service life.

This part cross-references Bosch 15191 and NTK 23521 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light caused by oxygen sensor faults
• Incorrect air-fuel feedback from a worn heated sensor
• Poor fuel economy related to exhaust sensor degradation
• Slow or inaccurate downstream sensor response
• Emissions test failures tied to sensor performance issues

Installation Notes and Tips

Verify the downstream front location before installation and compare the connector, wire count, and thread diameter to the original sensor. The specific-fit design is intended to simplify replacement on Mitsubishi Eclipse and Mitsubishi Galant models, but the sensor should still be matched to the vehicle’s exact engine and exhaust configuration before service. Use proper exhaust sensor removal practices to avoid damaging the threaded bung or wiring harness.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and function. The part number 234-4318 is built as a direct replacement for select Mitsubishi Eclipse and Mitsubishi Galant applications, with attention to sensor accuracy, durability, and correct installation geometry.