What size engine IS the Lexus NX 300h hybrid?
The NX 300h uses a 2.5-liter inline-4 Atkinson-cycle gasoline engine, paired with electric motors, for a combined powertrain.
In detail, the hybrid combines Lexus’ 2.5-liter four-cylinder engine (code-named 2AR-FXE) with electric motors and an electronic CVT, delivering a total system output around 197 horsepower in most markets. The design emphasizes efficiency, smooth acceleration, and seamless switching between gas-powered and electric propulsion. Depending on market and model year, drive configuration (front-wheel drive vs. AWD) and tuning can affect exact performance figures.
Engine size and configuration
Below are the core specifications that define the NX 300h's powertrain configuration.
- Displacement: 2.5 liters
- Engine code: 2AR-FXE
- Engine type: inline-4 with Atkinson-cycle operation
- Hybrid system: gasoline engine plus electric motor(s) with an electronic CVT
- Power output: combined system around 197 horsepower (roughly 147 kW); gasoline engine and electric motors contribute differently by trim and market
- Drivetrain options: front-wheel drive (FWD) or all-wheel drive (AWD) depending on trim
These specifications reflect Lexus’ approach to balancing efficiency with everyday usability in the NX 300h, using a compact 2.5-liter engine paired with electric propulsion to optimize fuel economy without sacrificing practicality.
Notes on power output and market differences
Exact horsepower figures can vary by model year, market, and drivetrain configuration. The quoted figure of about 197 hp represents typical values for the NX 300h’s hybrid setup across most regions, with minor variations possible.
How the engine works with the hybrid system
The 2.5-liter engine uses the Atkinson-cycle intake to maximize thermal efficiency, trading some peak horsepower for better fuel economy. The electric motor(s) provide immediate torque and assist during acceleration, and the system can operate in electric-only mode at low speeds. Lexus’ hybrid synergy drive manages power delivery through an e-CVT to maintain a smooth, efficient driving experience.
For context, this architecture has remained a core feature of the NX 300h since its introduction, though exact output and available drivetrains can differ by year and market.
Summary
The Lexus NX 300h’s powertrain centers on a 2.5-liter inline-4 Atkinson-cycle gasoline engine integrated with electric motors, delivering a combined output around 197 horsepower. This setup aims to deliver a balance of fuel efficiency and everyday performance, with variations by model year, trim, and market.
