Answer:
(Fatwa: 33/33=D/1429)
If you have purchased car by loan from a bank, then this dealing included interest which is haram; therefore get rid of the curse of interest as soon as possible. It is also alright to pay the remaining amount if you can manage it. You can pay it after selling the car as well if you think it better. Also, repent to Allah and ask for His forgiveness from the dealing of interest in past.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
