Denso 234-4431 Oxygen Sensor - Downstream Left or Upstream

Denso OE Style Oxygen Sensor 234-4431

Denso 234-4431 is an OE Style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for specific applications on Hyundai and Kia vehicles, including Hyundai Sonata, Hyundai Santa Fe, Hyundai Tiburon, Kia Optima, Kia Magentis, and related models.

The OE Style line focuses on direct-fit replacement parts that match factory requirements. This Denso oxygen sensor uses a threaded mounting design, a male connector, 4 wires, and a 16.10-inch wiring harness length for a clean installation on the correct upstream or downstream left location.

Key Features

• Heated oxygen sensor for precise exhaust monitoring
• Specific fit design for direct replacement
• Threaded mounting type with 0.708-inch thread diameter
• 4-wire configuration with male connector
• 16.10-inch wiring harness length
• Built to OE standards for factory-style fit and function
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

OE Style Replacement Details

Denso’s OE Style product line is aimed at drivers who want a direct replacement that follows original equipment dimensions and connector layout. For Hyundai Sonata 1999-2002, Hyundai Santa Fe 2001-2002, Hyundai Tiburon 2003, Kia Optima 2001-2002, and Kia Magentis 2001-2002 applications, part number 234-4431 is listed for upstream and selected downstream left positions. This part number 234-4431 also cross-references Bosch 13746 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light caused by a failing oxygen sensor
• Incorrect air-fuel mixture readings
• Poor fuel economy from inaccurate exhaust feedback
• Rough idle or drivability issues tied to sensor response
• Emissions test failures related to sensor performance

Installation Notes

• Verify the exact year, make, model, and sensor position before ordering.
• Confirm the connector style, wire count, and harness length match the original sensor.
• Use the threaded mounting point and proper exhaust sensor tools during removal and installation.
• Check for exhaust leaks or wiring damage that could affect sensor readings after replacement.

Quality Assurance

Denso manufactures and tests these oxygen sensors to OE standards for consistent fit and performance. The design includes contamination protection for the sensing element, supporting long-term accuracy in the exhaust stream.