Particulate filter
Extend my sympathy, found myself in the same situation the dealer staff knowledge was nil (on purchase) until I started to enlighten them with a few operational facts.
There are a number of postings on this subject on the various forums but have concluded that searches no longer appear too specific, can recommend XC 90 forum: Service Issues: XC90 D5 engine DPF (Diesel Particulate Filter)
All you can do is mitigate the situation, watch out on the instant mpg read out for a big reduction from normal and then you could use a lower gear to speed things up, bear in mind regeneration will not start until operating temperature is achieved. If it does not complete it carries over to the next time.
I have had regeneration over 5 legs covering 40 miles and effectively lasting 70 min, if you are lucky to be doing 60+ it completes in about 15 min.
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2001/02 S60 2.0T (Manual)
2005/06 S60 D5 SE (Manual)
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