1) Leaking water pump (pink crust underneath pulley and everywhere else)
2) ECU (Recalled for free)
3) Good visual inspection of the car. Take to a Dealer or independant mechanic for a Compenent inspection (Brake pad thickness, Tire treaddepths). If taken to dealer, take it after a long test drive. Request a Health check print out. This will reveal any pending dtc's which would show a MIL coming.
4) Make sure owners manual, Wheel lock key, Jack, and other emergency tools are present and accounted for
5) Ask dealer for service history, they can run VIN and print out all dealer related RO's/Jobs performed to the car
6) Car Fax?
7) Pray you dont make a bad purchase.
8) Lengthly test drive, under all conditions. Should set codes for any shop to pull if they are there