Buying a car from the car company via the company’s bank

Firstly: 

If the purchase is made
from the bank, then it is essential that the bank should own the car, or buy
it for itself first, then sell it to you by instalments. 

But if it does not own the
car, and does not buy it for itself first, rather its role is limited to
paying the company the price of the car on your behalf, then getting the
money back from you in instalments with something extra, this is not
permissible, because in fact they are lending you the price of the car, and
paying it on your behalf, on the basis that you will repay the loan with
interest, so it is a loan which brings a benefit, so it is riba. 

The fact that the bank
belongs to the company does not mean that it owns the cars that the company
owns. Hence we stipulated that the bank should take possession of the car
first, before selling it to you. 

For more information please
see the answer to question no. 20091
and 36410. 

Secondly: 

If the purchase is made
from the company with no involvement of the bank, there is nothing wrong
with that, even if the price of purchase by instalments is higher than the
price paid in cash, because the company is selling something that it owns.  

As for involving the bank
in this transaction, if it is only to make you pay the instalments through
the bank to the company, then there is nothing wrong with that. But if the
bank is to pay the full amount to the company then get it back from you in
instalments, then this is riba, as stated above. This form is common in
transactions with car companies, so you have to pay attention and beware. 

And Allaah knows best.