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Hi..there..
It depends on the saturation levels % wise within the DPF whether doing a good hard run on the motorway ideally will solve this. 20 mins minimum at around 50 mph in 4th..if its red then its means the DPF is reaching a critical point of blocking up..you could add a diesel addtive prior to doing so or use premuim diesel at the pumps..normally a forced regen might work but this is more a dealer level to carry that out..they may actually advise replacement if the DPF is beyond repair...but if the car seems to perform ok thena good run might help..if not then it will likely need further diagnoses dealer level..