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Are RX400h reliable?


The Lexus RX400h, a hybrid SUV introduced in 2005, has gained a reputation for blending luxury with fuel efficiency. But how reliable is this vehicle in the long run? As an experienced auto service provider, I’ll break down the key aspects of the RX400h’s reliability to help you make an informed decision.


What Makes the RX400h Stand Out?


The RX400h was one of the first luxury hybrid SUVs on the market, combining a gasoline engine with an electric motor to deliver better fuel economy and lower emissions. It’s known for its smooth ride, high-quality interior, and advanced technology for its time. But reliability is a critical factor when considering a used hybrid vehicle.


Reliability of the RX400h: Key Factors


When assessing the reliability of the RX400h, it’s important to consider the following factors:



  • Hybrid Battery Life: The hybrid battery in the RX400h is designed to last for many years, often exceeding 150,000 miles with proper maintenance. However, replacing the battery can be costly, so it’s essential to check its condition if you’re buying a used model.

  • Engine and Transmission: The RX400h features a 3.3-liter V6 engine paired with an electric motor. This combination has proven to be durable, provided the vehicle receives regular oil changes and maintenance.

  • Electrical Components: As a hybrid, the RX400h relies on advanced electrical systems. While generally reliable, issues with sensors or the inverter can arise over time, especially in older models.

  • Maintenance Costs: Routine maintenance for the RX400h is comparable to other luxury SUVs. However, hybrid-specific repairs, such as inverter or battery replacements, can be more expensive.


Common Issues to Watch For


While the RX400h is generally reliable, there are a few common issues that owners have reported:



  • Inverter Failures: Some RX400h models have experienced inverter failures, which can be costly to repair. Lexus issued recalls for certain model years to address this issue.

  • Brake Actuator Problems: The regenerative braking system can sometimes develop issues, leading to a need for actuator replacement.

  • Suspension Wear: Like many SUVs, the RX400h’s suspension components can wear out over time, especially if the vehicle is driven on rough roads.


Tips for Maintaining an RX400h


To ensure your RX400h remains reliable for years to come, follow these maintenance tips:



  • Stick to the manufacturer’s recommended maintenance schedule, including oil changes and hybrid system checks.

  • Have the hybrid battery inspected regularly, especially if the vehicle has high mileage.

  • Address any warning lights or unusual noises promptly to prevent minor issues from becoming major problems.

  • Consider purchasing an extended warranty if you’re buying a used RX400h to cover potential hybrid system repairs.


Conclusion: Is the RX400h Reliable?


Overall, the Lexus RX400h is a reliable hybrid SUV that offers a comfortable ride, excellent fuel efficiency, and the luxury features Lexus is known for. While it does have some potential issues, regular maintenance and prompt repairs can keep it running smoothly for many years. If you’re considering purchasing an RX400h, be sure to have it inspected by a trusted mechanic to ensure it’s in good condition.


Frequently Asked Questions

How much does it cost to replace a battery in a Lexus RX hybrid?


$2,000 to $8,000
While your typical auto battery costs around $100 to $200, a hybrid battery costs significantly more. In fact, hybrid battery replacement costs can vary anywhere from $2,000 to $8,000.



How much does it cost to replace a battery in a Lexus RX400h?


The average cost for a Lexus RX400h Hybrid High Voltage Battery Replacement is between $6,462 and $6,531. Labor costs are estimated between $264 and $333 while parts are typically priced around $6,198. This range does not include taxes and fees, and does not factor in your unique location.



How reliable is the Lexus RX 400h?


Now in 2023 it has 174,000 miles. It still runs like new, handles well, and is very comfortable. I have done maintenance and just did the Timing belt, spark plugs, and CVT fluid change. Toyota replaced the inverter under a recall so no issues there.



What is the most common problem with the Lexus RX400h?


Lexus RX400h Common Problems and Solutions

  • Rear seat rattle. Problem: Have you noticed a rattling noise coming from the rear seats?
  • Braking problems. Problem: There have been several reports of braking problems with the RX400h.
  • Leaking inverter. Problem: Have you noticed that the inverter is leaking on your RX400h?



How long does a Lexus 400h hybrid battery last?


Under normal conditions, you can expect Lexus hybrid car batteries to last up to 150,000 miles or 15 years and sometimes even longer. Learn all about Lexus hybrid battery replacement costs and more today with Lexus of Cerritos!



Can hybrid battery last 20 years?


As we mentioned, the battery life for most hybrid vehicles is around 10 to 20 years, if not longer. With proper maintenance, you can ensure that your hybrid is ready for any Westfield drive for thousands of miles.



Does Lexus RX 400h require premium gas?


You can put premium gas in your Lexus RX, and it can provide better performance, but it's not a requirement. Any gas that's put in your Lexus RX shouldn't be higher than 15% ethanol.



How long can a Lexus RX hybrid last?


250,000 miles
When properly cared for and driven, the Lexus RX can last for 250,000 miles or more. This longevity is thanks to the following: Performance: The Lexus RX has three engines from which to choose, all of which are highly dependable.



How many miles does a Lexus hybrid battery last?


150,000 miles
When to Do Hybrid Battery Replacement. Under normal driving conditions around Town 'N' Country or beyond, your car will require a hybrid car battery replacement approximately every 150,000 miles or after 15 years, whichever happens first.



What year of Lexus is most reliable?


According to various sources, the most reliable Lexus IS years include:

  • 2014 Lexus IS 300.
  • 2018 Lexus IS 350.
  • 2019 Lexus IS 350.
  • 2012 Lexus IS 250.
  • 2011 Lexus IS 250.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.