my c8 has been a nightmare from start to finish. first my turbo went, got that fixed, then the clutch. now im having this problem. the car is in limp mode saying there something wrong with the dpf filter, which as been took off and is clear. the other thing ive notice is that diesel is going to the sump. it ticks over fine but when driving it it as a miss on it and occasionally its lets out black smoke from exhaust which smells. anybody any ideas please thanks Edited 23/5/2016 Moderator, so easier to understand