I picked the car up on tuesday. On Wednesday on the way home the DPF FULL SEE HANDBOOK warning came on. I took it for a drive and about 30 mins later it went out. Tonight I went to the chippie and on the way home it came on again. Drove for about 40-50 minutes,  even putting in sport mode to keep the revs up, but it refuses to go out this time.  Also the car is VERY sluggish. Any ideas?