What do you mean it has "gone out"? Can you provide more symptoms of what you're experiencing? Earlier models, 04 and 05, did have problems with the sensors where water got in and caused corrosion. I thought that problem had been corrected. There are a lot of posts here on POL about the problems and what was done to correct them, from replacement to taking them apart for cleaning.
This is a known problem with the early design of the leveling sensor on the rear axle. It leaks, and the internal corrosion makes it operate poorly. There is a procedure posted here or on Prius Chat that details taking it out, apart, cleaning it, and resealing it. Much cheaper than the new part!
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