The 2006 Lexus RX 400h marked a significant milestone as one of the first luxury hybrid SUVs in the market. As part of the second-generation RX series (2004-2009), this mid-size luxury crossover combined a refined driving experience with impressive fuel efficiency. While not offered in traditional "trims," it came comprehensively equipped with available premium packages. Originally priced around $42,760 to $44,000, it stood out for its pioneering hybrid technology and Lexus's renowned reliability, making it a popular choice for eco-conscious luxury buyers.
The Good
The 2006 Lexus RX 400h offers smooth, spirited performance with its hybrid powertrain, appealing to those seeking quiet refinement and brisk acceleration. Its legendary Lexus reliability provides practical peace of mind, while the plush, quiet cabin ensures exceptional comfort. The elegant design exudes understated luxury. Excellent fuel efficiency for its class makes it economically appealing, balancing eco-consciousness with daily utility and strong value retention for a luxury SUV.
The Bad
Potential weaknesses for the 2006 Lexus RX 400h include the eventual high-cost replacement of the hybrid battery pack and known failures of the high-voltage inverter. The ABS actuator can also be a source of expensive repairs. While generally reliable, these hybrid-specific components can lead to significant ownership costs, and its infotainment system is quite dated by modern standards.
2006 Lexus RX 400h: Quick Overview
- Engine Options: The 2006 Lexus RX 400h features a sophisticated hybrid powertrain that combines a 3.3-liter Atkinson-cycle V6 gasoline engine with multiple electric motors. Specifically, it utilizes a 3.3-liter V6 engine, a powerful electric motor integrated into the transaxle for the front wheels, and a separate, smaller electric motor to power the rear wheels, effectively creating an on-demand all-wheel-drive (AWD) system. This setup delivers seamless power and impressive efficiency.
- Horsepower: The combined output of the hybrid system is rated at a robust 268 horsepower. This figure represents the maximum net power delivered by the gasoline engine and electric motors working in concert, providing strong acceleration for a mid-size SUV.
- Fuel Economy: EPA estimated fuel economy for the AWD 2006 RX 400h was impressive for its time, achieving approximately 27 miles per gallon in the city, 24 miles per gallon on the highway, and a combined rating of 26 miles per gallon. This efficiency was a major selling point compared to conventional V6 luxury SUVs.
- 0-60 Times: The RX 400h was capable of accelerating from 0 to 60 mph in approximately 7.3 seconds, a respectable time that often surpassed many of its non-hybrid V6 luxury SUV competitors.
- Towing Capacity: When properly equipped with the optional towing package, the 2006 Lexus RX 400h had a towing capacity of up to 3,500 pounds, making it suitable for light-duty towing needs.
- Key Features: The RX 400h was offered with a high level of standard equipment, and additional luxury features were often bundled into packages rather than distinct trims. Standard features typically included dual-zone automatic climate control, power-adjustable leather-trimmed front seats, a premium audio system with a six-disc CD changer, a power tilt/telescoping steering wheel, power liftgate, and 18-inch alloy wheels. Available options and package features included a touchscreen DVD-based navigation system, a Mark Levinson premium sound system, adaptive headlights (AFS), a rear-seat DVD entertainment system, a sunroof, and heated front seats. Safety features like Vehicle Stability Control (VSC), traction control, and a comprehensive airbag system were standard.
2006 Lexus RX 400h Specifications
Vehicle Information
| Year | 2006 |
| Make | Lexus |
| Model | RX 400h |
| Trim | - |
| Style | All-Wheel Drive |
| Type | Sport Utility Vehicle |
| Category | Standard Sport Utility Vehicle |
Manufacturing Details
| Made In | Japan |
| Manufacturing City | MIYAWAKA |
Dimensions
| Doors | 4-Door |
| Curb Weight | 4365 pounds |
| Gross Vehicle Weight Rating | 5520 pounds |
| Overall Height | 68.50 inches |
| Overall Length | 187.20 inches |
| Overall Width | 72.60 inches |
| Wheelbase Length | 106.90 inches |
| Standard Seating | 5 |
Engine & Performance
| Engine | 3.3-L V-6 |
| Engine Size | 3.3L |
| Engine Cylinders | 6 |
| Transmission | Automatic |
| Transmission Type | Automatic |
| Transmission Speeds | Continuously Variable |
| Drivetrain | All-Wheel Drive |
Additional Features
| Anti-Brake System | 4-Wheel ABS |
| Steering Type | Rack & Pinion |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | $46,060 |
| Invoice Price | $40,992 |
| Delivery Charges | $695 |
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What Problems Does the 2006 Lexus RX 400h Have?
While the 2006 Lexus RX 400h benefits from Lexus's reputation for reliability, specific hybrid components introduce potential long-term concerns. The most frequently reported and costly problem is the failure of the high-voltage inverter. This component converts DC power from the battery to AC power for the electric motors and vice-versa. When it fails, the vehicle can become inoperable, and replacement costs can run several thousands of dollars. While not exclusive to the 2006 model, it's a known issue across early Lexus and Toyota hybrids.
Another significant long-term reliability concern is the hybrid battery degradation. Over time and mileage, the nickel-metal hydride (NiMH) battery pack naturally loses capacity, eventually requiring replacement. This can also be a five-figure repair, although reconditioned or aftermarket battery options are available at lower costs. Signs include reduced fuel economy and hybrid system warning lights.
The ABS actuator failure is another notable issue, sometimes affecting the braking system's performance and illuminating dashboard warning lights. This is also an expensive repair due to the complex integration of the braking and regenerative braking systems.
Other less critical but commonly reported problems include issues with the HVAC blower motor, which can become noisy or fail, and various electrical gremlins related to wiring harnesses or sensors, though these are typically minor. Headlight assemblies can also experience fogging or yellowing over time, common for vehicles of this vintage.
Regarding recalls, owners should check the NHTSA database for any specific to the 2006 RX 400h. Historically, second-generation RX models, including the 400h, have had recalls concerning the power window master switch (risk of short circuit and fire), and certain braking system components or fuel pressure sensors. It's crucial to verify if all applicable recalls have been addressed before purchasing a used model. While the conventional gasoline engine and transmission are typically robust, the hybrid-specific systems are the primary points of concern for long-term ownership.
Another significant long-term reliability concern is the hybrid battery degradation. Over time and mileage, the nickel-metal hydride (NiMH) battery pack naturally loses capacity, eventually requiring replacement. This can also be a five-figure repair, although reconditioned or aftermarket battery options are available at lower costs. Signs include reduced fuel economy and hybrid system warning lights.
The ABS actuator failure is another notable issue, sometimes affecting the braking system's performance and illuminating dashboard warning lights. This is also an expensive repair due to the complex integration of the braking and regenerative braking systems.
Other less critical but commonly reported problems include issues with the HVAC blower motor, which can become noisy or fail, and various electrical gremlins related to wiring harnesses or sensors, though these are typically minor. Headlight assemblies can also experience fogging or yellowing over time, common for vehicles of this vintage.
Regarding recalls, owners should check the NHTSA database for any specific to the 2006 RX 400h. Historically, second-generation RX models, including the 400h, have had recalls concerning the power window master switch (risk of short circuit and fire), and certain braking system components or fuel pressure sensors. It's crucial to verify if all applicable recalls have been addressed before purchasing a used model. While the conventional gasoline engine and transmission are typically robust, the hybrid-specific systems are the primary points of concern for long-term ownership.
How long will the 2006 Lexus RX 400h last?
With proper and diligent maintenance, the 2006 Lexus RX 400h is known to be a durable vehicle, often achieving impressive longevity. Many owners report their vehicles exceeding 200,000 miles, and it's not uncommon to see well-maintained examples approaching or surpassing 250,000 to 300,000 miles, providing 15-20 years of reliable service. The conventional 3.3L V6 engine and eCVT transmission are inherently robust and designed for long life, typical of Toyota/Lexus engineering.
However, long-term durability is heavily contingent on the health of the hybrid components. The primary weaknesses over time remain the high-voltage hybrid battery and the inverter. While the rest of the vehicle, including the chassis, interior materials, and electronics (aside from the mentioned ABS actuator), holds up remarkably well, the potential for these expensive hybrid system failures dictates much of the long-term ownership cost and perceived durability. Regular hybrid system checks and preventative maintenance are paramount to maximizing its lifespan.
However, long-term durability is heavily contingent on the health of the hybrid components. The primary weaknesses over time remain the high-voltage hybrid battery and the inverter. While the rest of the vehicle, including the chassis, interior materials, and electronics (aside from the mentioned ABS actuator), holds up remarkably well, the potential for these expensive hybrid system failures dictates much of the long-term ownership cost and perceived durability. Regular hybrid system checks and preventative maintenance are paramount to maximizing its lifespan.
What Technology & Safety Features are Included?
The 2006 Lexus RX 400h, while advanced for its time, reflects the technology landscape of the mid-2000s. Its built-in tech included an available touchscreen DVD-based navigation system, which, though cutting-edge then, is dated by today's standards in terms of interface and map updates. A multi-information display in the instrument cluster provided hybrid system status and basic vehicle data. Bluetooth connectivity was offered, primarily for hands-free phone calls, but not for audio streaming.
For entertainment, the RX 400h came standard with a premium Lexus audio system featuring a six-disc in-dash CD changer. An optional and highly regarded Mark Levinson premium sound system was available, delivering exceptional audio quality with more speakers and a higher wattage amplifier. A rear-seat DVD entertainment system was also an option, providing a flip-down screen for passenger enjoyment.
Driver-assistance features were foundational rather than advanced. Standard systems included Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD), Brake Assist (BA), Vehicle Stability Control (VSC), and Traction Control (TRAC). An Adaptive Front Lighting System (AFS) was an available option, which swiveled the headlights in the direction of a turn to improve visibility. Modern driver-assist technologies like adaptive cruise control, lane-keeping assist, or blind-spot monitoring were not available on this model.
In terms of safety features, the RX 400h was well-equipped. It included dual-stage front airbags, front seat-mounted side airbags, side curtain airbags for both rows, and a driver's knee airbag. LATCH (Lower Anchors and Tethers for Children) child seat anchors were standard. A Tire Pressure Monitoring System (TPMS) was also included.
Regarding crash-test ratings, the 2006 Lexus RX 400h performed commendably. The National Highway Traffic Safety Administration (NHTSA) awarded it 5 stars for frontal driver and passenger crash protection, 5 stars for front and rear side-impact protection, and 4 stars for rollover resistance. The Insurance Institute for Highway Safety (IIHS) gave it "Good" ratings for moderate overlap front, side impact, and roof strength tests, contributing to its reputation as a safe family vehicle.
For entertainment, the RX 400h came standard with a premium Lexus audio system featuring a six-disc in-dash CD changer. An optional and highly regarded Mark Levinson premium sound system was available, delivering exceptional audio quality with more speakers and a higher wattage amplifier. A rear-seat DVD entertainment system was also an option, providing a flip-down screen for passenger enjoyment.
Driver-assistance features were foundational rather than advanced. Standard systems included Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD), Brake Assist (BA), Vehicle Stability Control (VSC), and Traction Control (TRAC). An Adaptive Front Lighting System (AFS) was an available option, which swiveled the headlights in the direction of a turn to improve visibility. Modern driver-assist technologies like adaptive cruise control, lane-keeping assist, or blind-spot monitoring were not available on this model.
In terms of safety features, the RX 400h was well-equipped. It included dual-stage front airbags, front seat-mounted side airbags, side curtain airbags for both rows, and a driver's knee airbag. LATCH (Lower Anchors and Tethers for Children) child seat anchors were standard. A Tire Pressure Monitoring System (TPMS) was also included.
Regarding crash-test ratings, the 2006 Lexus RX 400h performed commendably. The National Highway Traffic Safety Administration (NHTSA) awarded it 5 stars for frontal driver and passenger crash protection, 5 stars for front and rear side-impact protection, and 4 stars for rollover resistance. The Insurance Institute for Highway Safety (IIHS) gave it "Good" ratings for moderate overlap front, side impact, and roof strength tests, contributing to its reputation as a safe family vehicle.
What Colors Options are Available?
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2006 Lexus RX 400h Prices and Market Value
When new, the 2006 Lexus RX 400h had an original Manufacturer's Suggested Retail Price (MSRP) ranging from approximately $42,760 to $44,000, depending on options and packages. Today, its current used market price varies significantly based on condition, mileage, and maintenance history, typically falling within the $4,000 to $8,000 range. Exceptionally well-preserved, low-mileage examples with documented hybrid battery health might fetch slightly more.
The vehicle has experienced substantial depreciation from its new price, which is common for luxury vehicles and particularly for older hybrids due to concerns about the lifespan and replacement cost of the hybrid battery and inverter. Factors significantly affecting resale value include the overall mechanical condition, the operational status and health of the hybrid system (often a critical inspection point for buyers), documented service records, and the vehicle's cosmetic appearance. High mileage and neglected maintenance drastically reduce its value.
The vehicle has experienced substantial depreciation from its new price, which is common for luxury vehicles and particularly for older hybrids due to concerns about the lifespan and replacement cost of the hybrid battery and inverter. Factors significantly affecting resale value include the overall mechanical condition, the operational status and health of the hybrid system (often a critical inspection point for buyers), documented service records, and the vehicle's cosmetic appearance. High mileage and neglected maintenance drastically reduce its value.
2006 Lexus RX 400h Cost of Ownership
Ownership costs for a 2006 Lexus RX 400h are a mixed bag. Insurance premiums are generally moderate, reflecting its luxury status and repair complexity. Fuel efficiency is a strong point, making it economical at the pump for an SUV, though it requires premium unleaded fuel. Routine maintenance is on par with other luxury vehicles, typically higher than mainstream brands but lower than European rivals. However, potential repair costs for hybrid-specific components, like the inverter or hybrid battery, can be extremely high, easily negating years of fuel savings. In the long term, if these major hybrid components remain healthy, it can be relatively economical; if not, it can be quite costly to own.
2006 Lexus RX 400h Fuel Efficiency
Fuel Type
Hybrid
Fuel Capacity
26 gallons
City Mileage
27 miles/gallon
Highway Mileage
25 miles/gallon
2006 Lexus RX 400h Safety Rating
NHTSA
IIHS
2006 Lexus RX 400h Warranty
Basic
Original warranty
48 months / 50,000 miles
Estimated remaining
Expired
Powertrain
Original warranty
72 months / 70,000 miles
Estimated remaining
Expired
Rust
Original warranty
72 months / unlimited miles
Estimated remaining
Expired
2006 Lexus RX 400h Insurance
Insurance for a 2006 Lexus RX 400h is moderately priced, reflecting its status as a Sport Utility Vehicle with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2006 Lexus RX 400h Compare to Other Sport Utility Vehicle?
The 2006 Lexus RX 400h entered a luxury SUV market dominated by conventional gasoline-powered models, making it a unique offering. Key rivals included the Acura MDX, BMW X5, Mercedes-Benz ML-Class, and Volvo XC90.
In terms of performance, the RX 400h offered a smooth, refined, and surprisingly brisk acceleration (0-60 mph in about 7.3 seconds) that often outpaced base V6 versions of its rivals. Its hybrid system delivered immediate torque, enhancing urban driving. While the BMW X5 and Mercedes-Benz ML-Class offered more powerful V8 options and sportier handling, the RX 400h prioritized comfort and efficiency.
Features were competitive; the RX 400h provided standard luxury amenities like leather, power seats, and a premium sound system, with options for navigation and Mark Levinson audio comparable to its rivals. However, European competitors sometimes offered more advanced suspension systems or unique luxury touches.
Reliability was a strong suit for the RX 400h, building on Lexus's stellar reputation. It generally surpassed the long-term reliability of European rivals like the BMW X5 and Mercedes-Benz ML-Class from the same era, which were often plagued by more frequent and costly electrical and mechanical issues. The Acura MDX was its closest competitor in terms of overall reliability, though it lacked the hybrid efficiency.
Regarding price, the RX 400h was competitively priced new against its luxury counterparts. On the used market today, its price can be a double-edged sword: a potential bargain due to depreciation, but with the caveat of costly potential hybrid component repairs.
For those considering alternatives, if a hybrid is desired, newer models like the Lexus RX 450h (2010+) offer updated technology, more power, and refined hybrid systems, albeit at a higher used price. For a less luxurious but mechanically similar and reliable hybrid SUV, the Toyota Highlander Hybrid of the same era shares much of the RX 400h's powertrain technology. If hybrid complexity is a concern, a non-hybrid Lexus RX 350 (2007+) provides similar comfort and reliability without the specific hybrid component risks, and is often a safer used buy for long-term ownership. For better handling, a used Acura MDX from the same period is a strong alternative.
In terms of performance, the RX 400h offered a smooth, refined, and surprisingly brisk acceleration (0-60 mph in about 7.3 seconds) that often outpaced base V6 versions of its rivals. Its hybrid system delivered immediate torque, enhancing urban driving. While the BMW X5 and Mercedes-Benz ML-Class offered more powerful V8 options and sportier handling, the RX 400h prioritized comfort and efficiency.
Features were competitive; the RX 400h provided standard luxury amenities like leather, power seats, and a premium sound system, with options for navigation and Mark Levinson audio comparable to its rivals. However, European competitors sometimes offered more advanced suspension systems or unique luxury touches.
Reliability was a strong suit for the RX 400h, building on Lexus's stellar reputation. It generally surpassed the long-term reliability of European rivals like the BMW X5 and Mercedes-Benz ML-Class from the same era, which were often plagued by more frequent and costly electrical and mechanical issues. The Acura MDX was its closest competitor in terms of overall reliability, though it lacked the hybrid efficiency.
Regarding price, the RX 400h was competitively priced new against its luxury counterparts. On the used market today, its price can be a double-edged sword: a potential bargain due to depreciation, but with the caveat of costly potential hybrid component repairs.
For those considering alternatives, if a hybrid is desired, newer models like the Lexus RX 450h (2010+) offer updated technology, more power, and refined hybrid systems, albeit at a higher used price. For a less luxurious but mechanically similar and reliable hybrid SUV, the Toyota Highlander Hybrid of the same era shares much of the RX 400h's powertrain technology. If hybrid complexity is a concern, a non-hybrid Lexus RX 350 (2007+) provides similar comfort and reliability without the specific hybrid component risks, and is often a safer used buy for long-term ownership. For better handling, a used Acura MDX from the same period is a strong alternative.
Final Verdict: Is the 2006 Lexus RX 400h a Good Sport Utility Vehicle?
The 2006 Lexus RX 400h is ideal for buyers seeking a comfortable, quiet, and relatively fuel-efficient luxury SUV with a strong reputation for overall Lexus reliability. It's particularly suited for those who appreciate smooth power delivery and a refined driving experience, and who might value its pioneering hybrid status. It is exclusively a used car purchase now.
Is it worth buying? Yes, but with significant caution. A pre-purchase inspection (PPI) by a specialist familiar with Lexus hybrid systems is absolutely essential to assess the health of the hybrid battery and, crucially, the inverter. Look for examples with comprehensive service records. If these major hybrid components are sound, or have recently been replaced, the RX 400h can be a fantastic value, offering luxury and efficiency at a low used price. Avoid models with no service history or hybrid system warning lights unless you're prepared for potentially massive repair bills.
Is it worth buying? Yes, but with significant caution. A pre-purchase inspection (PPI) by a specialist familiar with Lexus hybrid systems is absolutely essential to assess the health of the hybrid battery and, crucially, the inverter. Look for examples with comprehensive service records. If these major hybrid components are sound, or have recently been replaced, the RX 400h can be a fantastic value, offering luxury and efficiency at a low used price. Avoid models with no service history or hybrid system warning lights unless you're prepared for potentially massive repair bills.
Simon A
Simon is a contributor to VinCheck, where he provides articles and reviews on various automotive topics. His work focuses on delivering accurate and up-to-date information about used cars, helping readers make informed decisions.