Hello, I am glad that I found this forum and hope for further advice on the following problem: I purchased an XC 70 D5 the day before yesterday, EZ 2010, 129 KW, 277000 km. The car makes a good overall impression and drives very well. Unfortunately, he brought the error ‘Motor: maintenance required’ yesterday when accelerating. The message had no effect on the performance. Everything went as before the report. I drove the vehicle to a car I knew and it was told e the error 029900 read out and reset. This morning I drove again and sporadically the error occurred again during moderate acceleration, without affecting the driving behaviour. Unfortunately I forgot that he told me as soon as the error comes again I should go to him without turning off the engine, so we connected the diagnostic device as ECG so to speak and I drove with the data logger really about 100 km with all the harassment mountain, valley, highway full throttle… unfortunately the Feh This was not the case. Diagnosis showed that the values were all in the frame. Device was suspended, on the way home after 10 km light climb, slightly accelerated, error again. Again driven, motor not switched off, diagnosis showed detailed errors with solution approaches, however always with the emergency run requirement which does not occur with me. So we removed the charge air generator (?) the part with the 30 torx under the cover of the engine, was coked, cleaned. cht and I drove overland again, often trying to provoke the mistake, iwann then came back. Maybe someone knows the problem and can give a tip? Would be a dream. Friendly greetings to you! Markus