John 
2007 Toyota Prius Hatchback 4dr Hatchback (1.5L 4cyl gas/electric hybrid CVT)
$5,500 transmission needed in only 101K miles!!!
 My Prius only made it 101K miles...carefully driven and faithfully maintained and suddenly the 'red triangle of death" light came on.  The "transmission" , which is comprised of a single planetary differential gear set and two electric motors, suddenly needs replacing. Toyota does not provide parts for rebuilding...they only sell a complete transmission (gears and motor) for $3,500 and it costs $2,000 to install it. There is a TSB on this so it's a known issue (codes POAA66, 526, and 613). The specific failure is caused by winding deterioration in the traction motor (MG2). So instead of selling the parts needed to rebuild (MG2) and providing instruction to rebuild...nope...you get a whole transmission. Oh...and good luck with the Toyota Corporation itself to help share the cost of a defective part...they took the information and never called back.  Keep in mind the batteries are original on this vehicle (another $3K)  they could go as well...so in essence...you are ROLLING A DICE when you purchase a Prius. Many get lucky based on what I read in the reviews but in my case and plenty of others (do your homework)...this was a 100K mile vehicle...and no more.