Is the 2007 Lexus RX 400h reliable?

The 2007 Lexus RX 400h is generally considered a reliable choice for a mid-2000s hybrid, especially by Lexus/Toyota standards. However, as an aging vehicle, reliability depends largely on how well it has been maintained and the health of the hybrid battery over time.

Reliability profile

Explaining why many buyers consider the RX 400h reliable involves looking at its underlying technology and brand strengths. The model uses Toyota’s proven hybrid system, which has logged years of operation across multiple vehicles, and Lexus’ emphasis on durability and dealer support adds to the overall reliability image.

Hybrid powertrain history

The RX 400h blends a 3.3-liter V6 with electric motors and a nickel-metal hydride battery, a configuration shared with other Toyota/Lexus hybrids of the era. This lineage has earned a reputation for durability in daily driving, long before the vehicle reaches high mileages. For a 2007 model, the most critical reliability question tends to be the health and performance of the hybrid system as components age.

• Proven hybrid architecture with shared components from Toyota’s hybrid lineup (Prius and Highlander Hybrid).


• Extensive parts availability and a broad service network supporting hybrid repairs.


• Strong brand reliability expectations from Lexus, which often translates to favorable ownership experiences.

Overall, the RX 400h tends to reward owners who stay on top of regular maintenance, particularly for the hybrid system. As with any aging vehicle, the reliability picture brightens with proactive care and comprehensive inspections.

What can go wrong

As the vehicle ages, several reliability concerns commonly surface for the 2007 RX 400h. These issues are not universal, but they are worth checking before purchase or during ownership.

• Hybrid battery health and cooling: Degradation over time can reduce electric assist and overall efficiency; replacement is possible but costly.


• Electrical system warnings: Older electronics can trigger advisory lights or sensor faults related to the hybrid system or ancillary components.


• Drivetrain and CVT wear: The hybrid integration uses a CVT in combination with electric motors; high mileage can lead to wear that affects response and efficiency.


• General age-related wear: Tires, brakes, suspension components, and other routine wear items require regular attention like any older SUV.

These concerns are not guarantees of failure, and many RX 400hs continue to perform reliably with disciplined maintenance and timely addressing of warning codes or abnormal symptoms.

Maintenance and ownership considerations

Maximizing reliability for a 2007 RX 400h involves disciplined maintenance and informed ownership decisions. The following guidance reflects common practices among owners and hybrid specialists.

• Regular hybrid system inspections: Schedule periodic checks of the battery, cooling system, inverter, and related electronics.


• Battery replacement planning: Be aware that a worn hybrid battery can be expensive to replace; costs vary based on whether you use new, remanufactured, or refurbished packs.


• Choose qualified service providers: A technician experienced with Toyota/Lexus hybrids can diagnose issues more accurately and avoid unnecessary repairs.


• Standard maintenance discipline: Adhere to oil changes, brake service, tire rotation, and fluid replacements to limit wear and preserve overall reliability.


• Warranty context: Manufacturer hybrid components were covered by dedicated protections during the era; with age, those protections have long since expired, so budget planning is prudent for future issues.

Following these practices helps maintain reliability as the RX 400h ages, keeping it roadworthy and capable for daily use.

Owner and expert perspectives

Automotive reviewers have generally praised the RX 400h for its comfort, ride quality, and efficiency for its class and era. Owners frequently cite dependable daily operation when routine maintenance is kept up, while noting that aging hybrid-specific parts can introduce surprises if maintenance lapsed or battery health declined. The consensus is that a well-maintained example can deliver solid reliability, but risk increases with high mileage and neglected servicing.

What to look for when evaluating a used example

When considering a used 2007 RX 400h, prioritize checks on the hybrid system’s health, battery condition, and any related warning codes. A thorough pre-purchase inspection by a hybrid-savvy mechanic is highly recommended to gauge overall reliability risk and anticipated future costs.

Summary

In summary, the 2007 Lexus RX 400h is generally regarded as a reliable option for a mid-2000s hybrid, thanks to Lexus’ durability standards and Toyota’s proven hybrid technology. Its reliability in practice hinges on maintenance history and the condition of the hybrid battery and electronics. With diligent upkeep, many examples offer dependable service well into their high-mileage years, though potential buyers should plan for battery-related costs and ensure thorough inspections before buying.

How reliable is a 2007 Lexus RX 400h?

The 2007 Lexus RX 400h is a highly reliable SUV, consistently earning high marks from owners. Key strengths include its durable Toyota-based engineering, strong hybrid system that can last for over 200,000 miles, and excellent fuel efficiency. Common potential issues to be aware of are the timing belt requiring replacement (around 90,000 miles), the possibility of water leaks into the hybrid battery compartment from a rear seam weld, and potential cracking in the plastic end tanks of the radiator.
 
This video discusses the reliability of the Lexus RX 400h and its potential issues, including the timing belt and battery: 59sTorque TalesYouTube · Mar 2, 2025
Reliability and strengths

• High ratings: The 2007 RX 400h has an excellent reliability rating of 4.8 out of 5 stars, according to consumer reviews. 
• Durable hybrid system: The hybrid battery can last for over 200,000 miles with proper care, and the vehicle can still run on gasoline if the battery fails. 
• Long-lasting components: Owners report that key components like brake rotors have a long lifespan. 
• Good fuel efficiency: The hybrid system provides excellent gas mileage, with some owners averaging 33-35 mpg. 

You can watch this video to see a test drive and review of the Lexus RX 400h: 1mHigh Peak AutosYouTube · May 4, 2020
Potential issues

• Timing belt: The 3.3L V6 engine has a timing belt that needs to be replaced every 90,000 miles. It's recommended to replace the water pump at the same time. 
• Water leaks: There is a known issue with water leaking into the hybrid battery compartment due to a seam weld in the rear of the vehicle. This was addressed by a technical service bulletin, but repairs can be expensive if the time limit has passed. 
• Plastic radiator end tanks: The plastic end tanks on the radiator can crack, leading to coolant leaks. This is especially common on vehicles that are prone to rust or corrosion. 
• Axle shaft: The front axle shaft can break, particularly on the passenger side. A bad axle can cause shaking or vibration. 
• Brake actuator: The brake actuator may need replacement around 150,000 miles. 

Maintenance and ownership tips

• Preventive maintenance: Regular maintenance, including checking and replacing fluids, is crucial for longevity. 
• Hybrid battery check: Consider having a hybrid battery health check done by a dealer or qualified mechanic. 
• Inspect for leaks: Check for water leaks from the sunroof drains and around the rear seam weld to prevent damage to the hybrid battery. 
• Keep vents clean: Ensure the vents for the hybrid battery cooling system remain clean and unobstructed. 
• Rust protection: If you live in a climate with road salt, make sure the vehicle's underbody is protected from rust. 

Is the Lexus RX400h expensive to maintain?

The estimated cost to maintain and repair a Lexus RX400h ranges from $105 to $3416, with an average of $415.

What problems do 2007 RX 400h owners report?

Top 2007 Lexus RX400h Problems

• Check Engine Light With Code P0AA6.
• Rocking or Surging Feeling at Freeway Speeds of 70mph.
• Lexus RX400h Check Engine Light P0AA6 Code with Water Leakage Causing Hybrid Battery Damage.
• Lexus RX400h clock adjustment issue remains unresolved.

What is the most common problem with the Lexus RX400h?

Top 10 Common Problems in Lexus RX 400h and How to Fix Them

• 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 Hybrid Automotive Service Can Help.