A SIMPLE KEY FOR PEUGEOT ADBLUE DELETE UNVEILED

Because very last diagnostics / code clearing drove 3 miles and lightweight back on / engine turned off straight away advertisement blue filler cap taken out and tried to blow/suck by cap to determine if ventilated. Cap will not be ventilated. left cap off and tissue in filler neck for 80 miles/no lights arrived on.No, not all diesel cars use AdBlu