The official line from most manufacturers is that if a modification causes a problem with the vehicle, then the part of the vehicle affected will not be covered under warranty. This does not necessarily mean a unilateral cancelling of the whole warranty.
Standard diagnostic equipment cannot detect an MAX TUNE remap. We can also return your vehicle to stock (reinstall the original map) if you would like us to for any reason via our AUTHORISED DELAER network or if you have our truetune.