So i have this problem i have E39 2000 528i so I accidentally broke the key chip i had, is not original cuz i went to the dealer and got the OEM, so the car won’t start no crank with oem key it does function the doors and all the lights ect., but i got a specialist not to friendly said its the key tumbler so i order the whole kit DME EWS and key tumbler+key, one of my questions is do i have to swap everything so the car can start, or can i swap the DME and EWS only and use the oem key?