Keeping settings after a dealership visit


When I bring my car to the dealership for any issues, they usually tell me the car has to be coded again. If I code my car using the E-Sys software, and bring it to the dealership, will they wipe out all of the changes that had been made by me throug E-Sys? And does E-Sys safe the last configuration so if it does get reset, I can simply just plug it back in and reload it, or do I need to completely recode all of the mods?

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