Denso 234-4237 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4237

Denso 234-4237 is an OE Style heated oxygen sensor built for direct replacement on select Kia and Hyundai applications. It is engineered for a specific fit and uses a threaded mounting design with a 4-wire female connector for straightforward replacement on the listed downstream positions.

For drivers searching for a downstream oxygen sensor for 2010-2013 Kia Forte, 2010-2013 Kia Forte Koup, or 2012-2013 Kia Forte5, this Denso sensor is built to match the original configuration. It also fits select 2009-2012 Kia Rondo, 2009-2010 Hyundai Sonata, 2010 Kia Magentis, and 2010 Kia Optima applications.

Key Features

• OE Style replacement oxygen sensor for specific vehicle applications
• Heated sensor design for downstream exhaust monitoring
• 4-wire female connector with 22.01 in. wiring harness length
• Threaded mounting type with 0.708 in. thread diameter
• Built to Denso OE standards for exact replacement fit
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Detailed Description

Denso 234-4237 is part of the OE Style line, which focuses on direct-fit replacement parts built to match original equipment specifications. The sensor is precision built for the listed applications, helping simplify replacement on downstream exhaust positions in Kia Forte, Forte Koup, Forte5, Rondo, Magentis, Optima, and Hyundai Sonata models. This part cross-references Hyundai/Kia 392102G400 and NTK 25200 for the same application.

The heated design supports faster sensor operation after startup, while the specific-fit construction helps ensure the connector, harness length, and threaded mount align with the factory setup. Denso also uses an aluminum oxide trap layer to help shield the sensing element from contamination that can affect exhaust feedback and engine management performance.

What This Oxygen Sensor Helps Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect exhaust feedback from a worn or contaminated sensor
• Reduced fuel economy caused by inaccurate air-fuel monitoring
• Rough engine operation tied to faulty emissions sensor readings
• Replacement needs after sensor aging, contamination, or wiring wear

Installation Notes and Tips

Verify the vehicle year, make, model, and downstream position before ordering. This sensor is a specific-fit, threaded replacement, so confirm connector style, wire count, and harness length against the original part. For best results, inspect the exhaust threads and connector condition during installation and compare the old sensor to the new unit before final fitment.

Fits 2010-2013 Kia Forte, downstream; 2010-2013 Kia Forte Koup, downstream; 2012-2013 Kia Forte5, downstream; 2009-2012 Kia Rondo, downstream; 2009-2010 Hyundai Sonata, downstream; 2010 Kia Magentis, downstream; and 2010 Kia Optima, downstream.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and consistent fit. The OE Style design reflects Denso’s focus on factory-matched dimensions and application-specific engineering for the listed vehicles.