Hyundai Sonata Optima 2.4L G4KJ GDI Engine 15–19

Description

The Hyundai/Kia 2.4L G4KJ GDI engine is an advanced and efficient motor designed for mid-size sedans. Built with Gasoline Direct Injection (GDI) technology, this engine delivers smooth performance, responsive power, and reliable efficiency. It is an OEM factory motor originally fitted in Hyundai Sonata and Kia Optima models, making it a perfect direct replacement.

This JDM/used engine comes with approximately 40,000–65,000 miles, which is significantly lower than many domestic used options. Every unit is compression-tested, visually inspected, and verified to meet OEM quality standards. Since it is a genuine Hyundai/Kia engine, installation is straightforward and designed to work with your existing ECU, wiring harness, and drivetrain.

Performance & Reliability

The 2.4L G4KJ GDI is part of Hyundai’s Theta II engine family, known for balanced power and fuel economy. Direct injection ensures precise fuel delivery for strong acceleration while maintaining efficiency. Our units undergo full testing to confirm healthy compression, smooth rotation, and clean internal components. This provides confidence in long-term reliability once installed.

Fitment

This motor is a direct OEM replacement for 2015–2019 Hyundai Sonata and 2016–2020 Kia Optima with the 2.4L GDI engine. It may also fit other Kia/Hyundai models sharing the same G4KJ platform.

Fits in:

2015 Hyundai Sonata 2.4L G4KJ GDI

2016 Hyundai Sonata 2.4L G4KJ GDI

2017 Hyundai Sonata 2.4L G4KJ GDI

2018 Hyundai Sonata 2.4L G4KJ GDI

2019 Hyundai Sonata 2.4L G4KJ GDI

2016 Kia Optima 2.4L G4KJ GDI

2017 Kia Optima 2.4L G4KJ GDI

2018 Kia Optima 2.4L G4KJ GDI

2019 Kia Optima 2.4L G4KJ GDI

2020 Kia Optima 2.4L G4KJ GDI

Warranty & Installation

Each engine includes a 6-month standard warranty. To ensure maximum lifespan, we recommend professional installation. During installation, all gaskets, seals, timing components, and fluids should be replaced. This guarantees optimal performance and prevents future issues.

Closing

With the Hyundai/Kia 2.4L G4KJ GDI engine, you are getting an OEM-tested, reliable, and fuel-efficient motor. Backed by warranty and inspected for quality, this unit is a cost-effective replacement to restore your Sonata or Optima to peak driving condition.