Denso 234-4438 Oxygen Sensor - Upstream Left

Denso OE Style Oxygen Sensor 234-4438

Denso 234-4438 is an OE Style heated oxygen sensor built for direct replacement on select Hyundai and Kia applications. It is engineered for a specific fit and uses a 4-wire, threaded design to match the original sensor layout on the vehicle.

For drivers searching for a replacement oxygen sensor for a 2006-2010 Kia Optima upstream left or a 2007-2009 Hyundai Santa Fe upstream left, this Denso sensor is built to match the original configuration and connector style.

Key Features

• OE Style replacement oxygen sensor for direct-fit service
• Heated sensor design for faster operating response
• Specific fit application with a male connector
• 4-wire construction for factory-style signal and heater circuit layout
• Threaded mounting type with 0.708 in. thread diameter
• 8.46 in. wiring harness length for original routing

Product Details

Denso manufactures this oxygen sensor to OE standards for accurate replacement fitment and consistent performance. Part number 234-4438 uses Denso’s aluminum oxide trap layer to help protect the ceramic sensing element from silicone and lead contamination, supporting stable engine management and fuel control over time. This part cross-references Bosch 15364 and NTK 25195 for the same application.

Compatible With 2007-2012 Kia Rondo, upstream left; 2007-2010 Kia Magentis, upstream left; 2006-2010 Kia Optima, upstream left; and 2007-2009 Hyundai Santa Fe, upstream left. The Denso 234-4438 is a direct replacement choice when the original upstream left sensor needs to be restored to factory-style operation.

Common Reasons to Replace

• Check engine light related to oxygen sensor performance
• Rough idle or inconsistent air-fuel mixture control
• Reduced fuel economy from inaccurate exhaust feedback
• Slow sensor response during closed-loop operation
• Fault codes tied to upstream left sensor readings

Installation Notes

Verify the connector, wire count, and upstream left location before installation. Because this is a threaded, specific-fit sensor, compare the original sensor length and harness routing to the vehicle before removal. Use proper oxygen sensor service tools to avoid damaging the exhaust bung or wiring during replacement.

Quality Assurance

Denso builds this OE Style oxygen sensor to strict original-equipment standards and tests each component for replacement accuracy and first-time fit. The design focuses on dependable sensor response, factory-style compatibility, and long-term durability in demanding exhaust conditions.