I have a 2E 2008 VW crafter 88 Deisel, I have had the DPF warning light come on yesterday, a quick trip up the motorway for 20 minutes normally solves the issue, today however the van wa sent up the motorway, but it was raining ... the van has come back with a flashing Coil Light flashing and the Exhaust System fault light on, as well asthe DPF wanring light still on - tomorrow I will follow my own thread to see if this resolves the issue:
DPF warning light | Ross-Tech Forums

I understand a regen requires a very hot temp in the exhaust to burn off the soot, could the rain have kept the DPF too cool ? it was driven ni 4th with 2500 on the rev counter, which in previous dry conditions I observed in VCDS,. kept the DPF above 500 deg.

Any one have any thoughts on my rain theory ?