Am I still obligated to purchase this car?

Did you buy the car and then do an inspection of the vehicle? If you bought the car then there is no right to rescind the contract. Read the contract - some car dealers will allow you to return the car (I know Carmax has a return policy, but there may be other dealers who do as well). If there is no policy, then see if the dealer will be willing to fix/repair the radio as a customer service gesture. You do not indicate whether the car was new or used (I assume its used) or whether the car was sold "as is" or with any kind of a warranty. If the car is still covered by any kind of a warranty, does it extend to cover the radio? If the car was sold "as is" that means what it says - the car was sold in whatever condition it was in at the time of purchase. It was up to you to check out the vehicle thoroughly and do an inspection (or have one performed by an independent mechanic) before you signed the purchase agreement. Your only out might be if the dealer had some kind of pre-sale inspection program and this was something that would ordinarily have been checked as part of that program. Otherwise, you will have a very hard time establishing that the dealer was aware of this problem and deliberately sold the car to you in this condition. Your other out might be if you financed the car. Most car dealers, if you applied for financing at the dealership, will submit an application for financing to lenders. Its up to the lenders as to whether to accept or reject. If the lenders all refuse to finance you then you will have to either find another way t o pay for the car or bring the car back.