Denso 234-4851 Oxygen Sensor - Downstream or Upstream

Denso OE Style Oxygen Sensor 234-4851

Denso 234-4851 is an OE-style heated oxygen sensor built for specific-fit applications on Hyundai and Kia vehicles. It is engineered for direct replacement use on downstream and upstream positions where listed, with a threaded mounting design and a female 4-wire connector for a precise match.

The OE Style line focuses on exact replacement fitment and factory-style performance. Denso builds this sensor to strict OE standards and uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine operation and consistent fuel control.

• Heated oxygen sensor for specific-fit applications
• Threaded mounting type with 0.708 thread diameter
• 14.57 wiring harness length
• 4-wire design with female connector
• OE-style replacement for downstream and upstream locations where listed
• Built to OE standards for direct-fit service

Fitment Details

• Fits 2001-2012 Hyundai Elantra, downstream
• Fits 2000-2011 Hyundai Accent, upstream
• Fits 2000-2011 Hyundai Accent, downstream
• Fits 2006-2011 Kia Rio, upstream
• Fits 2006-2011 Kia Rio, downstream
• Fits 2006-2011 Kia Rio5, upstream
• Fits 2006-2011 Kia Rio5, downstream
• Fits 2010-2011 Kia Soul, downstream
• Fits 2005-2010 Kia Sportage, downstream
• Fits 2005-2009 Hyundai Tucson, downstream
• Fits 2004-2009 Kia Spectra, downstream
• Fits 2005-2009 Kia Spectra5, downstream
• Fits 2003-2008 Hyundai Tiburon, downstream

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the engine control system
• Reduced fuel economy caused by a worn sensor
• Slow sensor response during closed-loop operation
• Emissions test failures tied to sensor degradation

Installation Notes

Confirm the sensor position before ordering, since this part is listed for both upstream and downstream applications depending on vehicle. Match the connector style, wire count, and threaded mounting dimensions to the original sensor on the vehicle. For Hyundai Elantra, Hyundai Accent, and Kia Rio applications, verify the exact engine and sensor location against the vehicle’s original equipment listing before installation.

This part cross-references Bosch 13461 and NTK 24588 for the same application.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and first-time fit. The OE Style line is designed for direct replacement service, with construction intended to maintain sensor protection and long-term performance in demanding exhaust conditions.