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Problem setting a used ECU to my Outback Legacy-2,5L


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After having several problems, I came to the conclusion that I have to replace the ECU.

After setting the part and starting installation, diagnostic machine gives to immobilizer code: 3781, but then systems requires a five (5) digit number.

Does anyone know what is that number??
My car is Subaru 
Outback Legacy-2,5L-year:2006.
 

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