Yesterday I experienced what seemed to be a sudden, complete power steering failure. The car (2006 RX400h) became very hard to steer, especially to the right. Straight ahead or a few degrees either side was no problem. I did what troubleshooting I could, but there is very little on this subject in the owner's manual. The "PS" warning light was not on, there was no evidence of fluid leakage, and there had been no collision, curb strike or other stress on the steering. I wrestled it to the dealer (45 min away) who expressed amazement that I was able to drive it at all. The technician sad it likely "needed a rack", referring apparently to the rack-and-pinion steering. This car has 22,500 mi, has never been off-road or otherwise abused. They did give me a loaner car, said they'd likely need the car for several days and would call. Thank goodness we're still under warranty. Parenthetically, if this had happened to my wife I don't think she would have been able to control it (64y.o., tiny at 61"). This car has electric power steering, so there is no belt to fail, no fluid reservoir to check, not even a fuse to replace.