I have the newer 1.6 and recently had a DPF Pressure Sensor fault
Here's my thread on it if it helps;
https://www.volvoforums.org.uk/showp...&postcount=492
https://www.volvoforums.org.uk/showp...&postcount=493
https://www.volvoforums.org.uk/showp...&postcount=494
My fault hasn't returned yet, but at least I have all the parts needed to fix it when it does.
However, I feel I should maybe just fix it now as if the pressure sensor isn't working properly, the DPF might not regen when it should and eventually block up, then I will be screwed....