There are diverse reasons why people buy cars. Some people buy for luxury, some buy to have something to take them from point A to point B, some buy cars that would likely not give them a lot of issues.
There are people who buy to have all these qualities in one car.
Over a very long time, Toyota/Lexus cars have been known to be very reliable and users have trusted the brand.
There are technical reasons why they are so reliable and we are going to discuss them. But before that, what is reliability? It is the quality of being reliable, dependable or trustworthy. So, a car that can take you from point A to point B without breaking down is deemed very reliable to a user.
Why Toyota/Lexus cars are very reliable
1. High mean time between failure (MTBF)
This is the average time an equipment operates between breakdowns. From reviews and experience, Toyota and Lexus cars can work for a long time before any repair is carried out on them and they work for a long time before another failure occurs after a repair has been correctly carried out.
Another factor that affects reliability of a system is its maintanability. This is how easy it is for that system to be maintained or whether it is possible to be repaired or easy to be fixed without the manufacturer being involved in the maintenance. As it is well known, Toyota and lexus brands can be fixed easily. Sometimes, even novice mechanics fix them. Even DIY owners fix some issues without stress. This makes it easy for a car user to get repairs done without spending fortunes.
3. They are not too complex
The systems in Toyota/Lexus cars including their engines are simple. Non-complex systems have lesser number of components. The more components a system has, the lesser its reliability.
4. Low mean time to restore
This is a result of maintanability and simple design. This is the average time it takes to restore a system from a failure state to a working state. Since these cars are simple and not so complex, time to repair is lesser. This also reduces labor cost.