WHAT DOES PEUGEOT ADBLUE REMOVAL MEAN?

I've carried out something else so I wanted to share my solution to be able to check out that can help Some others who may have the same problem. I did not set a gap in my gas cap (I've older design without white or black dot in addition to it) but I have pull off black rubber ring through the neck of a gasoline tank that's benith cap and place the