Denso 234-4194 Oxygen Sensor - Downstream, Downstream Left or Upstream

Denso OE Style Oxygen Sensor 234-4194

Denso 234-4194 is an OE Style heated oxygen sensor built for direct replacement on select Hyundai and Kia applications. It is engineered for specific fitment, accurate signal response, and dependable exhaust monitoring on downstream and upstream positions where listed.

The Denso OE Style line is built to match original equipment fit and function, with precision construction for first-time installation. This sensor also uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine performance and fuel economy over time.

• Heated oxygen sensor for faster operating readiness
• Specific-fit design for direct replacement
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• Wiring harness length: 16.93 in.
• OE Style construction for select Hyundai Santa Fe, XG350, and Kia Optima applications

Detailed Fitment and Application

Compatible With select 2002-2012 Hyundai and Kia vehicles, this sensor is used in emissions control systems that monitor exhaust oxygen content and help the engine control module adjust air-fuel delivery. Fits 2007-2012 Kia Rondo, downstream; 2007-2010 Kia Magentis, downstream; 2006-2010 Kia Optima, downstream; 2007-2009 Hyundai Santa Fe, downstream left; 2003-2006 Hyundai Santa Fe, upstream; 2004-2006 Kia Amanti, upstream; 2003-2006 Kia Sorento, upstream; 2002-2005 Hyundai XG350, upstream; and 2002-2005 Kia Sedona, upstream. Denso 234-4194 is also a direct OE-style replacement for service work where the original sensor has aged or failed.

This part cross-references Bosch 15367 and NTK 25158 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Slow or inaccurate exhaust oxygen signal response
• Fuel trim issues caused by a worn sensor
• Reduced fuel economy from degraded sensor output
• Emissions test failures tied to sensor malfunction

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for upstream, downstream, and downstream left locations depending on the vehicle. Confirm connector style, thread diameter, and harness length against the original sensor before installation. Because this is a specific-fit threaded sensor, proper routing and secure connector engagement are important for reliable operation.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for fit, function, and durability. The OE Style design is intended to provide the correct replacement part for the listed Hyundai and Kia applications, with contamination-resistant construction to support long-term service life.