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Max2000b is bang on the money here.
Typically a remapped/flashed ECU will be detected by a checksum error when and if the BMW dealership plugs the car into the diagnostic tools.
However, not knowing if this shows up as a big read light on the screen or it has to be looked for is another question.
I have the SuperChips remap on my 118i and I just have the car flashed back before it goes to the dealer. However as this map was developed using my car and one other it keeps the remap cost at a low rate. Otherwise it would be expensive.
Still, cheaper than warranty work.
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