A DPF or any part of the exhaust system can crack through rust / age / vibration / metal fatigue / accident damage / hitting something on the road / something on the road hitting it (stone) / driving over a ridge (curb).
You can best determine what caused the damage by lying on the ground under the car with a torch and looking at the crack.
Yes, DPFs are expensive.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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