At the beginning of the year my DPF was 75% saturated. I ran the DPF cleanout procedure on the diagnostic software and it dropped to about 70%. Never having owned a car with one before I thought that was probably normal.
Roll on a to a a couple of weeks ago and the car is intermittently going into limp mode. After lots of checks I notice the DPF is at 84%. I ran the clearout programme and no change. In fact the DPF would complete the full 8 minute sequence.
So the cars on stilts and I notice, by accident, that the flexi part of the exhaust has the very slightest leak, you can't notice it unless you really listen.
So I order a new front section and replace it.
Car still in limp mode, I start thinking about £300 bills to have it mapped out.
Took the car on the M56 and ran it in 4th and 5th to Manchester and back. Everytime it went into limp I turned the engine off on and put my foot down.
Eventually limp stopped. Hooked it up to the Diagnostics - 10%
So anyone with DPF problems...try checking you haven't got a small leak in your exhaust causing the Regen not to run properly.