Good evening I have a problem on a mercedes class a180 cdi atv of the year 26/02/2007 while driving the esp failure light comes on the electric steering becomes hard and if I switch off the car does not start immediately (does not turn motor avv) but after a few minutes in diagnosis on the abs control unit this error C1AE6 Rotation speed sensor and on the key control unit the code 900E unlock plausible .

Thank you in advance if this has already happened to any colleagues

FERRONI STEFANO