Hello dear people, with the car of my friend the engine control light is on all 2-3tkm, with the error code P2002. A manual regenaration of the DPF provides here first of all for remedy, but the error appears again and again. Can you give me possibly tips what it might be. All values concerning the DPF are from my point of view i.e. it regenerates also without mucking, if I drive it over the tester. The vehicle has only run 106tkm. Thank you for your help.