My 2014 X1 recently had the recall service done and the custom coding is still intact. I only had a few things done, none of it engine related. The seat belt chimes were disabled, auto door locks were disabled, the blinker was changed from 3 to 5, some other warning chimes were disabled. Everything still works as before.
I did ask the service manager at the time of the recall service if it would affect the custom coding and he said sometimes it does, sometimes not, depending on what coding was done, but he did not elaborate.
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