WHAT DOES PEUGEOT ADBLUE DELETE MEAN?

I must fix it fast as on Friday I'm heading for your periodic check RWC. I haven't any diagnostic technique, do you think by getting rid of the battery I am able to reset the error if I'll change the adblue injector?I’m in no posture to invest hundreds on this car or truck and tied into finance for a minimum of A different 18 months just before I