NTK 25732 Oxygen Sensor - Downstream

Direct Fit Oxygen Sensor for Hyundai and Kia

The NTK Direct Fit Oxygen Sensor, part number 25732, is a heated downstream sensor built for specific applications in Hyundai and Kia vehicles. It uses an OE-equivalent design to support accurate exhaust monitoring and straightforward replacement on the listed models.

NTK’s Direct Fit Oxygen Sensor line focuses on application-specific coverage, with sensor construction controlled from raw materials through finished product. As part of the NGK family of products, NTK supplies oxygen sensors with fit, form, and function aligned to original equipment requirements.

Key Features

• Heated oxygen sensor for downstream placement
• Specific-fit design for direct replacement on listed Hyundai and Kia applications
• 4-wire configuration with a 24.5-inch wiring harness
• Threaded mounting type with 18 mm thread diameter
• OE-equivalent design for factory-style sensor replacement
• Part number 25732 for easy catalog matching

Detailed Description

NTK 25732 is a direct fit oxygen sensor engineered for downstream use on select Hyundai Elantra, Elantra Coupe, Elantra GT, Kona, Sonata, Tucson, and Kia Forte, Forte Koup, Forte5, Optima, Seltos, and related applications. It is built as a heated sensor with a threaded mount and vehicle-specific harness length, helping maintain proper exhaust feedback in the original sensor location. This part cross-references Bosch 15580 for the same application.

For buyers searching for a downstream oxygen sensor for 2020-2024 Kia Forte, a replacement oxygen sensor for 2016-2019 Hyundai Sonata, or an OE-style oxygen sensor for 2014-2016 Kia Forte California emissions applications, NTK 25732 provides a direct-fit option matched to the listed vehicles.

What This Sensor Helps Address

• Check engine light caused by a failing downstream oxygen sensor
• Incorrect exhaust oxygen readings affecting engine management feedback
• Sensor response issues from age, heat exposure, or contamination
• Replacement needs for OE-equivalent downstream sensor applications
• Fitment concerns when replacing the original Hyundai or Kia sensor

Installation Notes and Tips

Verify the vehicle year, make, model, and downstream position before ordering. Confirm the connector style, 4-wire layout, and 18 mm threaded mounting point against the original sensor. For best results, compare the existing sensor harness length and routing to the replacement part before installation.

Use the listed fitment to match the application exactly: Fits 2020-2024 Kia Forte, downstream; Fits 2021-2024 Kia Seltos, downstream; Fits 2020-2021 Hyundai Kona, downstream; Fits 2020-2021 Hyundai Tucson, downstream; Fits 2020 Hyundai Elantra, downstream; Fits 2020 Kia Optima, downstream; Fits 2018-2019 Hyundai Kona, downstream; Fits 2016-2019 Hyundai Sonata, downstream; Fits 2019 Hyundai Tucson, downstream; Fits 2019 Kia Forte, downstream; Fits 2014-2016 Kia Forte, downstream; Fits 2017-2019 Kia Optima, downstream; Fits 2014-2016 Hyundai Elantra, downstream; Fits 2014-2016 Kia Forte, downstream; Fits 2014-2016 Kia Forte Koup, downstream; Fits 2014-2016 Kia Forte5, downstream; Fits 2014 Hyundai Elantra Coupe, downstream; Fits 2011-2013 Hyundai Elantra, downstream; Fits 2013 Hyundai Elantra Coupe, downstream; Fits 2013 Hyundai Elantra GT, downstream.

Quality Assurance

NTK manufactures oxygen sensors with extensive testing during production to help ensure quality and reliability that meet or exceed OE specifications. The brand’s OE-focused engineering and ceramics expertise support consistent performance across import and domestic applications.