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If you google Lexus LS400 starter you will find loads of info,if as I suspect all you get is a click when you turn the key it will be the stater motor or more specifically worn out contacts in the starter motor.
Replacing the contacts is easy getting the starter motor out is not easy
My '98 had the same symptoms. There was no click, click that I'd normally hear to indicate it was the starter. Although it started most of the time, from time to time, the car just wouldn't start. This went on for months. Once I had to have it towed to the dealer and they had it for several days and couldn't find anything wrong (it started for them). I replaced the battery. When I eventually replaced the starter, the problem stopped.
@bjjenkin, you don't say what year ls400 you have.
I did my 95, it takes time but it can be done. 98-00 years are easier than earlier years because no EGR tube running through the rear water bypass bridge.
@bjjenkin, you don't say what year ls400 you have.
I did my 95, it takes time but it can be done. 98-00 years are easier than earlier years because no EGR tube running through the rear water bypass bridge.