
As a result of the modification to the ECU you have potentially impacted on other components within the vehicle.
Any failure of these parts that would be deemed to have been affected by the change to the ECU will not be covered by warranty.
Its like putting a pressurised water/heating system into your home then your existing shower starts to leak (because it's not designed to work with high pressure systems0 The shower isn't covered under warranty as the fault was the boiler/cylinder not the shower itself)
