NOT KNOWN FACTS ABOUT PEUGEOT ADBLUE DELETE

Due to the fact last diagnostics / code clearing drove three miles and light-weight back on / engine turned off straight absent ad blue filler cap removed and attempted to blow/suck via cap to determine if ventilated. Cap is just not ventilated. still left cap off and tissue in filler neck for 80 miles/no lights arrived on.I’m in no position to s