2. Throttle valve gets broken. In diesel engine this is used only for smooth engine shutdown, and for the DPF regeneration. No functional throttle valve -> no regeneration. 3. Regular too short driving distance. Engine does not warm up to the 75c degree temperature and the regeneration does not happen.
The temperature is around 600 degree, giving it a good blast whilst regenerating or pottering around has no part of regeneration temps, infact flooring it whilst regenerating seems to drop the temps.this is the opposite of driving whilst not regenerating where wot put temps up around 350 degrees.
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how does bmw dpf regeneration work