hello everyone. i own a 2012 c250cdi ( 651 engine. 40000km on the clock ) my problems is that on normal drive at 2500rpm my car goes on limp mode ( can rev till 3000rpm ) and no check engine light come on. When i switch off the car and back on then everything is fine. on hight rev or below the 2500 the car drives normal. just for the record no fault codes are in ECU.

just for the record i clean dpf also replace the dpf pressure sensor. . my problem was before this job done and still is there.

any suggestion ? any other with similar problem ? smt else to check on the car ?