If you have been refused car finance then there may be a number of reasons for this. The main reason however is generally due to your credit rating, the credit rating system is used by many lenders who use third party rating companies to provide them with information about your credit worthiness.
If you have a bad credit rating this means that your credit score, usually represented by a number is low. Below a certain threshold means that many lenders or finance providers will refuse to give you credit. The reason you have a bad credit history is usually because you have either not enough credit history or that you have had problems in the past with repaying previous loans, non or late payment of bills or other demands.
If you do not know what your current credit score is you can request this information from one of the credit houses who by law and usually for a fee can provide you with details of your credit history.
Once you have established that you are not likely to be able to get car finance with bad credit due to your past bad credit rating history then you can seek alternatives. There are companies that specialise in lending or providing car finance to people who need a car or a car loan but have been previously refused credit.
You can get some companies that provide guaranteed car credit but you will find that the rates of interest charged can be quite high. Bad credit car loans can be provided by some car dealers who specialise in providing used cars to people with a poor credit history. You will however have a limited choice of car as you will be buying a car from them in return for getting credit.