Those are SCR (Selective Catalytic Reduction) codes, specifically for
the pee tank.
I don't know about MBZ, but 2014-2015 Chevy Cruze had a lot of tank
heater warranty claims, and urea quality poor codes that were from a bad
sensor in the tank and didn't go away when you drained the urea and
filled with fresh.
A bad tank heater wouldn't be a great thing in January, that stuff
freezes like water.
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