Update - dosed fuel with regen additive then spent 2 hours on a nearby freeway at above 2000 RPM - regen started happening about 1.5 hours in going up a long hill. Clogging down to 24% and the ECU is happy to allow boost again.

Engine light plus limp mode on my 2011 159 Ti. MES current version (May 2025) plus set of green/red/yellow etc cables, the green cable successfully connects to the ECU. MES shows a P1206 error which I understand means DPF differential pressure measurement out of range, apparently attributable to the...