What is Missouri Law for paying off repossessed cars?

The laws for all US states are much the same. In MO. when a vehicle is repossessed by the lender due to a default in the terms of the contract the lender is required to sell the vehicle at public auction for the amount closests to its assessed value. If there is a discrepancy in the amount for which the vehicle is sold and the balance of the loan, the lender may pursue collection for that amount in the manner the law allows, which can include a lawsuit.