Prior to transfering the ownership of the vehicle, you would need to pay up the remaining excise duty for the car, you would need to go in person to Customs dept with the REP approval letters and your vehicle registration card for an invoice on how much is remaining. They normally revert in a week. Once you pay up, the JPJ system would then receive a notification from them that your car is eligible for transfer of ownership (that you have paid the balance of excise duty).