NTK 25733 Oxygen Sensor - Downstream

Direct Fit Oxygen Sensor for Hyundai and Kia

NTK 25733 is a direct fit heated oxygen sensor built for specific downstream applications on select Hyundai and Kia vehicles. It uses a threaded mounting design, a 4-wire configuration, and a 29.5-inch wiring harness length for OE-style replacement on the vehicles listed below.

NTK’s Direct Fit Oxygen Sensor line focuses on original equipment-style fit, form, and function. As part of NTK’s OE sensor expertise, this sensor is manufactured with ceramic technology control from raw material through finished product and is tested during production for quality and reliability.

Key Features

• Part number 25733 direct fit oxygen sensor
• Heated sensor design for downstream exhaust monitoring
• Specific fit application for listed Hyundai and Kia models
• 4-wire configuration with threaded mounting type
• 29.5-inch wiring harness length
• 18 mm thread diameter
• OE-equivalent design for factory-style replacement

Detailed Product Overview

This NTK oxygen sensor is intended for downstream placement on select 2011-2018 Hyundai and Kia vehicles, including Hyundai Elantra, Elantra Coupe, Elantra GT, and Tucson, plus Kia Forte, Forte5, Forte Koup, and Rondo applications. If you are searching for a downstream oxygen sensor for 2016-2018 Hyundai Tucson or a direct fit oxygen sensor for 2014-2018 Kia Forte, NTK 25733 matches the listed OE-style applications.

This part cross-references Bosch 18143 for the same application. It is also listed against OE numbers including 392102E500 and 392102E502.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Fault codes tied to downstream air-fuel monitoring
• Slow or inaccurate exhaust sensor response
• Emissions inspection failures caused by a worn sensor
• Replacement needs after sensor aging, contamination, or wiring wear

Installation Notes and Tips

Verify the vehicle year, make, model, and downstream position before ordering. Confirm the 4-wire connector style, 18 mm thread diameter, and harness length against the original sensor to ensure proper routing and connection. Because this is a threaded direct fit sensor, installation should follow the vehicle service procedure for exhaust sensor removal and torque specification.

Quality Assurance

NTK is a major original equipment oxygen sensor manufacturer, and this Direct Fit Oxygen Sensor is manufactured and tested to meet or exceed OE specifications for fit and reliability. The NTK 25733 is built for consistent performance in the listed Hyundai and Kia applications.