The yellow triangle just means general fault, the main display below should tell you specifically what the problem is (e.g. blown bulb). If it won't go away or tell you what it is, get a code reader to check it. If you don't have access to one, most garages will usually plug it in and diagnose for free
You seem to have two problems then.I don`t know anything about turbo boost and wether that will affect the regen process or not,but if the car is drivable and you ignore the DPF warning you could be in big trouble.Hope all go`s well.