Originally Posted by SBill

I have also experienced this vibration issue on my 2007 RX 350. It only occurs on the highway and it seems to be pretty random. Usually you can feel the steering wheel start to tighten and then it starts to gently vibrate and gets stronger the longer you drive until you have to pull over (I have captured it on video several times).

I took the car to two different dealers on multiple occasions (Westminster) and (Pleasanton) and was told to have the tires balanced, then check the rims, then get new tires, etc. I spent $1,200 on new Michelins which have been balanced at two separate shops, most recently Big O tires. But the problem persist.

This is very annoying and sometimes outright frightening, especially for my wife who shuttles two small kids around in this vehicle. It is especially disconcerting in that it only occurs at highway speeds. We travel between LA and SF often and it will be three or four hours into the trip before the shaking starts, we pull over, stop the car (but do not turn it off) and then merge back onto HWY 5 and it will be fine for the rest of the trip. Insane!

Another mechanic told me he thought it might be a defective ball bearing in the CV joint of the front axle, which means you need a new front axle. I mentioned this to the Lexus dealers but got no response. I am not inclined to spend another $1,500 on the vehicle unless I am sure that it will resolve the problem.

So my question to the forum is has anyone been able to fix the random vibration issue and if so what exactly did you do?