Quote:
Originally Posted by The Gritz Carlton
You can do all the regens you wish but if the DEF fluid is bad from sitting too long (very common with vehicles sitting around a long time)...the light will continue to come on. Drain the DEF tank and refill with fresh juice.
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Ya that's good advice but doesn't pertain to his problem he said dpf soot sensor which is only in the dpf system and def fluid is only used in the scr system to reduce nox levels.
There are 2 parts to the exhaust systems dpf and scr.
the dpf collects and hold soot in a doc filter until its full enough to trigger a regen passive or forced the soot is burned into ash and held in the dpf filter then exhaust flows out the dpf through a decomp tube where the def doser is located and def fluid is injected into the exhaust stream and carried into the scr system where is is turned into basically ammona and with the metals made up in the scr the nitrous oxide is reduced to epa acceptable levels normally 80% less then the inlet nox and a little water vapor and nitrogen exit the tail pipe.