Nissan Repair: nissan patrol 2000, nissan patrol, humid environment

Question
i have a Nissan patrol 2000 diesel 3.0 and it started having problems with the turbo which I changed, then with the injection, which I changed also, now it presents weird codes and what they told me is that I need a new computer? My question is where can I get the computer? Used or new at a fair price. Please help in what you can and also how can I ask for this equipment? thank you

Answer
Max,

Here in the United States the solution is a qrecking yard one.  But, before you do it be sure to disconnect the computer and reconnect it and see if that gets rid of the codes.  If you are in a humid environment corrosion can get to the terminals and that might be the fix.  But, if not you are looking at about $150 for one from the wrecking yard or $600 from the dealer for a rebuilt unit.