I have an 03 rx300 sel and have had two bad experiences with the suspension....the first was sorted as a broken wire found (after a lot of threats about nearly £2000 to fix!) and the second is corrosion around the sensors which leads to bad signals to the computer and the system shows as being turned off.....a good clean of the sensors and some wd40 and a fair amount of prodding etc has don the trick......no new sensors yet!