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Ad Blue Incorrect Quality and 512 mile Warning

95K views 100 replies 38 participants last post by  donhall415  
Yes, I had the same issue which was fixed simply by a software update and a re-priming of the system via diagnostic software.
No sensors or pump replacement, no draining of tank, and no cleaning of injector or anything.
Might be worth looking into that first if it's cheaper than the other options.
Mine was done by the JagAssist man-in-a-van as it was still in warranty.

I don't believe it was a software bug in the code as such, just that the parameters used to determine DEF quality were set too restrictively and were loosened up by the software update.
Also, I think that if the tank is overfilled then the system has issues reading the DEF sensor(s) and falls back to reporting invalid fluid. Something I only vaguely recall reading on a TSB somewhere.