You should have at least 5 mbar at idle. If there is no pressure then fault is logged. Cause could be hole in DPF.
Permanent. Anything between few hundred and 20 000+ km. If ECM would stop regeneration then DPF would be clogged very soon. Definately in 20 000 km. I have validated by checking DPF pressure and accumulated soot quantity. Also by driving the car and checking exhaust temperature.
Software version may be different but I seriously doubt that this logic would be different. And there is no MIL for glow plug code.
Can you endoscope the DPF and share some pictures? That will be nice...
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