fitting new ecu to 1.2 /04 micra se

If i wanted to fit a new/secondhand ecu to my car do i have to have it recoded !What are the pit falls,any advice welcome if 100%
thanks ADI: :doh:
 
I think the best bet is to try it and see. I don't think they are coded like the eariler ones. (I may be wrong however - having never had to do any work on one of those ecus!)
 
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