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Clearing these codes should be pretty easy if they have the correct equipment(scantool). It's just like clearing any other computer memory. You are dealing codes from several ECU's... the codes with P are in Power-train (Engine) ECU, the B codes are in the Body ECU and the U0151 are for the Multiplex Communication System.
The P1604 code is very common across all Toyota models and can be ignored, yes, even Toyota says to ignore it.
The C1241 could be for a variety of reasons. Most often due to a low battery and or charging system issue.
The other three, C1290,B1790, U0151 are of concern. Also the fact that this is a Rebuilt title is not good.
Have you bought this yet?
Have you checked to see if your Insurance will even cover this vehicle (some do not)?