It is illegal to help a friend borrow money to buy a car. If there is the purpose of illegal possession in the loan, it may constitute the crime of loan fraud; If there is no purpose of illegal possession, it is not illegal, but if the loan is not repaid, it should bear the responsibility of repaying the loan and interest according to law.

legal ground

Article 193rd of the Criminal Law of People's Republic of China (PRC) is under any of the following circumstances. Whoever defrauds banks or other financial institutions of loans for the purpose of illegal possession, if the amount is relatively large, shall be sentenced to fixed-term imprisonment of not more than five years or criminal detention, and shall also be fined not less than 20,000 yuan but not more than 200,000 yuan; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than five years but not more than ten years, and shall also be fined not less than 50,000 yuan but not more than 500,000 yuan; If the amount is especially huge or there are other particularly serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined not less than 50,000 yuan but not more than 500,000 yuan, or his property shall be confiscated: (1) fabricating false reasons such as introducing funds and projects; (two) the use of false economic contracts; Using false documents; (four) the use of false proof of property rights as a guarantee or repeated guarantee beyond the value of collateral; (5) obtaining loans by other means.