A motor vehicle includes an internal combustion engine, an after-treatment device to treat first exhaust gases produced by the internal combustion engine, a first exhaust line configured to feed the first exhaust gases to the after-treatment device, combustion means configured to produce second exhaust gases with a combustion chamber and an injector device that can be controlled to inject the fuel into the combustion chamber, a second exhaust line configured to feed the second exhaust gases to the after-treatment device, a tank to hold the fuel, and a supply line configured to feed a fuel stream from the tank to the injector device, the supply line comprising a valve that can be controlled according to at least one first control mode and a second control mode, wherein the valve respectively allows and prevents a fuel flow passage to the injector device.