An intermittent no start condition may be caused by a failed "Push Start" switch. Replacing the failed switch should correct this concern.Google+
Car Problem Reports
Lexus LS460 Intermittent No Start Due to Failed "Push Start" Switch
Lexus LS460 Problem
Average Mileage: 43,238 mi (22,000 mi - 62,000 mi)
Visitor, 2007 Lexus LS460, 51,500 mi
Push the button. Tries to start. seems to just die. Push again and it starts
Visitor, 2008 Lexus LS460, 52,110 mi
I will push the brake, green light comes on, I will push the starter button and nothing, sometimes it doesn't start until the 3rd or 4th time. I have replaced the battery in both the car and the FOB, still not fixed. In shop now for a diagnostic.
Visitor, 2008 Lexus LS460, 62,000 mi
intermittent clicking and no start. Will start with a couple of tries
Visitor, 2011 Lexus LS460, 33,822 mi
It just happened today. . . I have not had it diagnosed or fixed yet.
Visitor, 2007 Lexus LS460, 38,000 mi
About 1 in 20 times the car does not start on the first try.
Visitor, 2011 Lexus LS460, 22,000 mi
Having ignition/satrting problems. Has not been corrected.