What's a forced regen?
It's a forced regeneration cycle to burn the soot off. They stick a special additive in the tank and it blows all the crap out of the exhaust. Shouldn't cost anymore than £100Manufacturers don't tell you because they expect people to know. It's written in the handbook and of course it'll damage sales if they do. Also damages profits as typically diesel cars are more expensive to buy.
If the DPF is clogged with soot it's good, just needs a clean, if it's clogged with ash you'll need a new one.
You can actually take the thing out in all honesty
I hate diesels now, Mercedes lured us into one years ago and it had dpf problems after 3 years which was a pain. We hadn't been told