Question: questions to ask when buying a used prius?
Answer: (1) Make sure you like the Prius driving experience before you sign on the line. ... 
(2) Decide which generation you want: second (2004-2009) or third (2010-present) ... 
MORE: 2010 Toyota Prius - full review. ... 
(3) Be aware of 2004-2009 weak spots. ... 
(4) Know your battery warranty--which is based on your state.