had the same message and symptoms on my xc90 which had high mileage
the crunch of the problems were the swirl flaps, EGR fully blocked with carbon and my DPF blocked with soot. try and find some one who can force a regen on your Volvo and go from there working backwards to the EGR VALVE CLEAN IT OUR THEN LOOK AT THE SWIRL FLAPS IF YOU HAVE THEM ON YOUR CAR
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