white powder in exhaust pipe and P205C CEL
I have a 2011 Sprinter (2012 AI with 39k miles) and the CEL came on. There is no DEF light and the CEL is not flashing. No countdown (yet). Scanner suggests P205C issue (heat sensor in DEF tank). History showed P205B codes (also heat sensor). I am traveling in Albuquerque, and if this is just an issue related to heating the DEF fluid above freezing levels, I would prefer to drive home to CA where any work will be warranty for a year. I also noticed white powder (like baking soda) inside exhaust pipe). Also, the DEF seems to be consumed at high levels.
Properly thawing DEF isn't an issue on this trip as I'm not in freezing temps, but does the high consumption rate of DEF or white powder point to larger issues I need to be concerned about? I am out of warranty except for EGR valve which has a 10 year warranty, so hoping that this is a related to EGR...