Hello guys, I have weird exhaust problem. The car is Civic 8th gen 2.2 ctdi 2009. Sometimes the car goes into a mode where the exhaust sound becomes really deep like a racecar, the engine fan turns on, the mileage goes high and it start to smoke a lot. The car has a DPF, but no "DPF regeneration needed" message. I've had this message twice since I got the car 5 months ago but both times the car was not in that mode and I just drove until it came off. This starts to happen more and more often. Is it possible that the DPF is blocked even though I get no message? Or is there some other problem? Thanks in advance!