Denso 234-8031 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-8031

Denso 234-8031 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 with a male connector and 23.98 in. wiring harness length for downstream locations.

The OE Style line is Denso’s direct-fit replacement range, focused on exact dimensions and connector match for straightforward service on vehicles such as the Hyundai Tucson, Hyundai Santa Fe, Kia Sportage, Kia Sorento, Kia Optima, and Hyundai Sonata.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for OE-style replacement
• 4-wire configuration with male connector
• Threaded mounting type with 0.701 in. thread diameter
• 23.98 in. wiring harness length
• Built and tested to OE standards for replacement accuracy
• Includes Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

Detailed Description

Denso 234-8031 is a direct-fit downstream oxygen sensor designed for precise replacement on 2015-2022 Hyundai and Kia models. It is engineered to match OE dimensions and connector layout, helping restore accurate exhaust feedback for engine management systems. This part cross-references Hyundai 392102GBB0 and NTK 25240 for the same application.

As part of Denso’s OE Style product line, this sensor is manufactured to strict original-equipment standards and built for first-time fitment. The heated sensor design supports faster operating temperature, while the protective trap layer helps reduce contamination-related wear for consistent performance over time. Search terms such as downstream oxygen sensor for 2020-2022 Kia Sportage, 2020-2021 Hyundai Tucson downstream O2 sensor, or 2015-2017 Hyundai Sonata OE style oxygen sensor all point to this application.

What It Helps Address

• Check engine light caused by a failing downstream oxygen sensor
• Incorrect exhaust oxygen readings affecting fuel control
• Reduced fuel economy from inaccurate sensor feedback
• Slow sensor response from contamination or age
• Direct-fit replacement needs for Hyundai and Kia exhaust service

Installation Notes and Tips

Confirm the downstream sensor location, connector style, wire count, and thread size before installation. This part is a specific-fit threaded sensor, so matching the vehicle application is important for proper installation. Verify the vehicle year, make, and model against the listed fitment for Hyundai Tucson, Hyundai Santa Fe, Kia Sportage, Kia Sorento, Kia Optima, and Hyundai Sonata.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and fit. The OE Style line is intended to deliver the correct part and the correct fit for the listed applications, including 2015-2022 Hyundai and Kia downstream sensor locations.