Apologies but Adblue question

Any suggestions to the problem guys? I have noticed its not done a regen for a while. Would that have any bearing on the Adblue?
I know all emissions systems tend to be interlinked?
 
No suggestions from me I'm afraid, I haven't had to top mine up yet, there are lots of similar threads on here, the Adblue system does seem to cause a LOT of problems.

My trusted garage man did say to use a bottle of decrystallizer stuff every time I top up though. May be snake oil ...
 
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