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DPFs are a pain in the butt. They're WEAR ITEMS and yes, this means they wear OUT. In passenger vehicles they combine the DPF with the cat, so when it wears out (not if!) you get to buy a new cat that's not broken -- and spend 2-3x as much money as necessary. Oh, and the combined design means you can't clean them mechanically off-vehicle either.
Heavy trucks have the DPF and cat separate. Yeah.
I will not buy a vehicle with one, which means no newer diesel for me -- and this is one of the (many) reasons. DEF is another expensive nightmare when something goes wrong with the urea injection system.
Normally it will regen on its own when on the highway, but if it's failing to do so and you are putting a reasonable amount of highway drive-time on the vehicle the DPF has probably failed, and you won't like the price of having it replaced.