I've no experience in DPF/DPD regeneration in cars but plenty with trucks. What I found was that if you weren't aware of what it means, what it's doing and why then you probably by paying little attention to the processes it was. going through could easily make matters quicly much worse. DPD systems require heat in the exhaust to burn off the soot and normally when it's around time to regenerate it either waits until. it's hot enough or it sprays fuel in the exhaust to rapidly increase the heat until it's hot enough to gon hrough the regeneration cycle. As I said I can only talk about my experience with trucks but a symbol, basically like a puff of smoke lights up green to let you know it's. regenerating. So long as you never turned the engine off during a regen cycle it should be fine but if you do it obviously kills the cycle before it's finished. Do it some more times then you'll find the same symbol lighting up orange or red and flasing. If you see that you have to pull over and do a manual regen cycle which could take 30-45 mins. The more you ignore these things or unaware of them the more likely you'll suddenly find yourself in limp home mode and barely able to get past 30mph. That's the problem, it needs heat but if the truck or cars lots of short journeys it never really gets to burn off the deposits that can quickly block thesystem up :(