"Necesito comprar un carro."
Translation:I need to buy a car.
You can also say coche instead of carro. Coche is the spanish way and carro the latin american way
Coche and Carro is the same you can use either or to mean Car
Necesito comprar un coche
Necesito comprar un carro
Both mean "I want to buy a car"
As already said... carro is not used at all in Spain! I want to learn spanish, not latino-american!