I've run a diagnostic check on a 307 hdi 110 and its coming up with dpf fault. The car drives slow and no noticeable boost or power. I can't hear or see any boost leaks and no funny smoke issues. We did a forced regeneration today and it made no noticeable improvement. It also keeps loosing oil filler caps indicating high crankcase pressure.
I've read this could be because the dpf is blocked right up and it will need to be removed and jet washed out. The car has over 100,000 miles and is on original dpf and it does short runs around town. No visible diagnostic lights are showing on dash.