how much would it cost to replace the whole computer system of a 2010 ford fusion? on 2010 Ford Fusion

I bought a 2010 ford focus at the auction. While trying to have the whole vehicle checked, I am told that "there are problems with the computer". I don't know what those problems are, but since I got the car for a very good price, I am trying to decide whether it would be worthwhile to replace the computer myself. The decision is hinged on how much it would cost me.

1 answer
Unfortunately, it's wide open as to what is causing the problem. The car has definitely been through somehting substantial.