How much horsepower does the RX400h have?
The RX 400h has a combined system output of 268 horsepower (199 kW).
Powertrain and horsepower figures
Below is the breakdown of how the RX 400h achieves its total horsepower through its Hybrid Synergy Drive.
Engine and electric motor contribution
The RX 400h blends a 3.3-liter V6 gasoline engine with electric motors. The gas engine is rated at about 208 horsepower, while the electric motors provide additional power to boost the system output to 268 horsepower overall.
Before listing the power components, note that the following figures reflect the published combined output for the RX 400h's Hybrid Synergy Drive rather than engine-only ratings.
- Gasoline V6 engine: approximately 208 horsepower
- Electric motors: provide supplementary power to reach a combined output of 268 horsepower
- Net combined horsepower: 268 horsepower (199 kW)
Conclusion: The 268-horsepower rating represents the total power available from the hybrid system, not just the gasoline engine alone.
Performance context
In real-world driving, the 268 hp combined rating helps the RX 400h feel capable for a vehicle of its size, delivering smooth and steady acceleration with the efficiency benefits of a hybrid drivetrain. The actual feel of power can vary with model year, tire choice, and drivetrain configuration (front-wheel drive vs. all-wheel drive).
drivetrain configuration and what it means for power
The RX 400h uses a front-mounted gas engine with electric motors that enable all-wheel drive capability, providing seamless power delivery across conditions while optimizing fuel economy. The 268 hp figure is the official system output used by Lexus for this model year.
Summary
The Lexus RX 400h combines a 208-horsepower V6 with electric assist to deliver a total of 268 horsepower. This hybrid setup prioritizes smooth acceleration and efficiency in a midsize luxury SUV.
What is the most common problem with the Lexus RX 400h?
Top 10 Common Problems in Lexus RX 400h and How to Fix Them
- Brake Actuator Malfunction.
- Cooling System Issues.
- Transmission (CVT) Problems.
- Faulty Oxygen Sensors.
- 12V Auxiliary Battery Problems.
- Dashboard Melting (Cosmetic Issue)
- Water Leaks in Rear Hatch or Sunroof.
- Suspension Wear and Noises.
How much horsepower does a Lexus RX 400h have?
Engine
| Horsepower | 268 hp @ 5,600 rpm |
|---|---|
| Torque | 212 lb-ft @ 4,400 rpm |
| Valves | 24 |
| Cam type | Double overhead cam (DOHC) |
| Valve timing | Variable |
Which is better RX 350 or RX 400h?
The main differences are that the RX 400h is a hybrid with better fuel efficiency, a quieter ride, and a unique all-wheel-drive system, while the RX 350 has more base engine horsepower and a more traditional powertrain and AWD system. The RX 400h is a better choice for city driving due to its EV mode and efficiency, but the RX 350 may be preferable if you prioritize raw horsepower and a conventional, more easily serviced powertrain.
This video compares the Lexus RX 400h with the RX 350: 47sBern on CarsYouTube · Mar 2, 2025
| Feature | RX 400h (Hybrid) | RX 350 (Gasoline) |
|---|---|---|
| Powertrain | 3.3L V6 gasoline engine + electric motors | 3.5L V6 gasoline engine |
| Horsepower | 268 hp (combined system output is higher) | 270 hp |
| Transmission | Electronically controlled continuously variable transmission (CVT) | 5-speed automatic |
| Drivetrain | Hybrid all-wheel drive (uses an electric motor for the rear wheels) | Traditional all-wheel drive |
| Fuel Efficiency | Better, especially in the city, with an average around 25 MPG | Lower, with an average around 20 MPG |
| Driving Experience | Quieter and smoother, with the ability to run on electric power alone at low speeds | More traditional acceleration and engine sound |
| Brakes | Uses regenerative braking, which can feel different and may require an adjustment period | Traditional brakes |
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RX 400h is better for
- Fuel economy: The hybrid system significantly improves gas mileage, especially in stop-and-go city traffic.
- Quiet operation: The vehicle can operate in electric-only mode at low speeds, making for a very quiet ride in residential areas or parking lots.
- Smoothness: The hybrid system is generally very smooth, with no engine jolt when starting up from a stop.
RX 350 is better for
- Simplicity: The gasoline-only powertrain is more conventional and may be easier to work on, with no hybrid battery or complex electrical components to worry about.
- Highway range: The RX 350 has a slightly longer highway range due to its more efficient conventional fuel system and larger fuel tank.
- Engine power: It has a slight edge in base engine horsepower and a more traditional feel when accelerating.
What is the 0 to 60 time for the RX 400h?
The Lexus RX400h's 0 to 60 mph time is approximately 7.0 to 7.5 seconds. This is achieved through a combination of its 3.3L V6 engine and electric motors, which provide instant torque for a quick launch. Reviews indicate times ranging from 7.0 seconds in testing to a published figure of 7.5 seconds, and one source even cites 7.3 seconds.
You can watch this video to see a review of the Lexus RX400h including its acceleration: 1mJJ on CarsYouTube · Sep 13, 2025
- Published figures: The RX400h is typically rated between 7.0 and 7.5 seconds for 0-60 mph.
- Performance: The hybrid system, with its electric motors providing immediate power, helps the SUV accelerate quickly from a standstill.
- Comparison: The RX400h's 0-60 mph time was competitive for its time and even faster than the standard gas-only RX 330 model it was based on.
This video shows a test drive and 0-60 acceleration run of the Lexus RX400h: 58sHondata97YouTube · Nov 30, 2023
