My V6 Sprinter 318 cdi from 2007 shows the following errors: Offset drift in idle mode and offset drift under load. In the meantime, for 3 months, various workshops have tried the car unsuccessfully and I have replaced AGR valve, air mass meter, turbo, KAT and DPF and a temperature sensor unsuccessfully. Also the engine control unit was tested and found for error-free. I repeated the car, repeatedly deleted errors, then drove about 4 weeks normal, but then mostly in the trailer drives again in emergency run… The two errors 2623 and 2624 can not be deleted even if the engine is not running. Does anyone have an idea what is in the wrong place? Thanks in advance