Originally Posted by ernest917
Is regen associated with DEF???? Not familiar with it is....
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Regen has nothing to do with DEF. They are two completely different systems. Not trying to belittle you at all Ernest.
DEF is used to cut down on exhaust emissions.
Regen is simply when the DPF-(Diesel Particulate Filter) gets full of soot, and requires it to be burned off. It uses diesel gas to heat up the filter to temps upwards of 1500 degrees Fahrenheit so the soot can be burned off to clean the DPF.
Regen is generally done automatically when you are driving at highway speeds, however there are instances where it may require you to do a manual regen if you are not up to highway speed and can't be done automatically.