Torque App - OBD2 Car Check Pro will help you determine your monthly car payment and total loan amount for a given car loan. How to use? - Enter your vehicle. - Please fill OBD2 form. - Using basic mode, enter an amount, an annual interest rate, and the length of the loan in months to determine your payment and loan information. - Using advanced mode, you can enter trade-in values, down payments, tax rates, and more, to determine your payment and loan information. Numbers are automatically calculated and updated as you enter your information.