Hi, Guys. I am new in this forum, but I have a question and hope you can help me

:
I am wondering to buy a Porsche Cayenne 2004 3.2 V6 of a Friend with 78K miles. The car recently had the problems above, that already was fixed. I would like to know how severe those errors code are and how reliable the 3.2 engines are?
Thanks in advance.