Get the registration number of the car and go on line and do an HPI check (RAC offer this service). It costs about £20 and it will tell you immediately if there is outstanding finance.It is extremely important that you do this before purchasing a used car.I did this the other day on a car I was thinking about buying and it had outstanding finance!est Answer: Go to www.rac.co.uk/web/vehicle-checks/car-dat... I have used this several times recently whilst looking for a car for my daughter and it has stopped me buying a couple of cars. It only costs £5.