THE BEST SIDE OF PEUGEOT ADBLUE DELETE

Since previous diagnostics / code clearing drove 3 miles and light back again on / motor turned off straight absent advert blue filler cap taken out and tried to blow/suck as a result of cap to determine if ventilated. Cap is just not ventilated. left cap off and tissue in filler neck for 80 miles/no lights came on.At first assumed dealership exper