The principal of the car loan has been overcharged. At this time, you need to find a lending institution. If only the loan application is submitted and no loan contract is signed, then the loan amount can be modified. However, the loan contract has been signed and it is found that the loan amount exceeds the standard. Before lending, you can consult the lending institution. If the loan has been made, there is no way to change the loan amount.

Users are advised to pay attention to key information such as loan amount, term and interest rate when signing a loan contract, which will be difficult to modify after signing the contract.