Volvo V50 2.0d Error 246B Particle filter Regeneration ratio

Hey guys, I hope there’s some help here.. from my Opel earlier I was used to finding any problem online what to find but at Volvo it looks rather bad compared :/ It’s about a Volvo V50 2.0d from 2009 A few weeks ago I got the message that the soot filter is full so I had the DPF renewed 2-3 weeks ago (not original, the old one looked okay but still just renewed), message came back at some point, then bought a used differential pressure sensor (original). Message came back. I then thought, maybe the workshop just didn’t reset the DPF, even reset it and then 2 days no report. Before that came back again the message soot filter full but disappeared after about a minute. In the fault memory at first (according to the workshop) nothing was deposited. When the DPF (from me) was reset, and also earlier the error “246B particle filter regeneration ratio” was saved. Does that mean that it is too often trying to start a regeneration? My next idea would have been a new sensor (of course also original) but I don’t know how to buy the same thing at the same time?