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What if I got a second ecu then if I ever need warranty work I could put it all back to stock and reinstall the original ecu?
I do not believe that this is possible.
I asked this question some time before, to my friend, a service shop foreman at my dealer.
The modules (ECU included) in these new cars do not talk to each other right out of the box.
They need to be initialized to communicate with the other modules once installed.
This is done using a Ford Service Computer with online connection to Ford.
The module is then set to your VINs original programming.

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