Depends what the remap actually did and if it's configured some parts as absent (DPF, EOLYS, ADBLUE tank, EGR, cat, etc.) and if those parts have been removed from the car.
If it was a straightforward BHP gain then it will just revert back to stock
Good points, if its still under warranty that may be toast if found.
Not sure how they could react if its potentially illegal, ie if the DPF has been taken out or other emission alterations, would they just refuse to work on it once discovered or would they report the issue to the relevant authority?
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