THE BEST SIDE OF PEUGEOT ADBLUE DELETE

Considering that past diagnostics / code clearing drove three miles and lightweight again on / engine turned off straight absent ad blue filler cap eradicated and attempted to blow/suck by way of cap to check out if ventilated. Cap is just not ventilated. left cap off and tissue in filler neck for 80 miles/no lights arrived on.I’m in no situation