For example, if you have two car loans at the same bank and you default on the first loan, the bank may be able to repossess the first car. However, the bank may not be able to repossess the second car if you are still making payments on that loan.
If you are concerned about the possibility of your cars being repossessed, you should contact your bank and discuss your options. You may be able to work out a payment plan that allows you to keep both of your cars.