Denso 234-4444 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4444

Denso 234-4444 is an OE-style heated oxygen sensor built for direct replacement and precise signal control in downstream applications. It is engineered for specific fitment, making it a strong match for drivers servicing a 2010-2013 Hyundai Tucson downstream oxygen sensor or a 2011-2018 Kia Sportage downstream oxygen sensor.

Key Features

• Heated oxygen sensor with 4-wire design for stable exhaust monitoring
• Specific-fit replacement for direct installation on listed applications
• Threaded mounting with 0.708 in. thread diameter
• 17.36 in. wiring harness length for OE-style routing
• Male connector for factory-style electrical connection
• Built to OE standards for accurate replacement and first-time fit
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Details

This Denso OE Style oxygen sensor is designed to replace the downstream sensor on select Hyundai and Kia vehicles, including the Hyundai Tucson and Kia Sportage. The heated sensor design helps the engine management system monitor exhaust oxygen content after the catalytic converter, supporting proper fuel control and emissions system operation. Part number 234-4444 is also referenced by Bosch 18038, Hyundai/Kia 392102G650, NTK 25202, and Walker Products 250-24864 or 350-34390 for the same application.

Denso’s OE Style line focuses on exact replacement dimensions and factory-like fitment. The sensor uses a threaded mounting type, a male connector, and a 4-wire configuration to match the original equipment layout on the listed vehicles. If you are searching for a downstream oxygen sensor for 2011-2018 Kia Sportage or a downstream oxygen sensor for 2010-2013 Hyundai Tucson, Denso 234-4444 is built for that service position.

Common Issues This Part Can Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel feedback from a worn or contaminated sensor
• Reduced fuel economy caused by inaccurate exhaust readings
• Emissions test failure tied to oxygen sensor faults
• Slow sensor response from age, heat, or contamination

Installation Notes and Tips

Confirm the vehicle year, engine configuration, and downstream position before ordering. Compare the connector style, wire count, and harness length to the original sensor to verify a proper match. Because this is a threaded sensor, inspect the exhaust bung threads and surrounding area before installation to ensure clean seating and accurate torque.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent replacement performance. The aluminum oxide trap layer adds protection for the sensing element, helping maintain durability in demanding exhaust conditions.