"Ich habe kein Auto."

Translation: I do not have a car.

[daniel.n]

Why is the article "a" required if there is no "ein"?

[GuardianCiego]

Also "I have no car". The point is the use of singular. Besides, there is an 'ein' being used: consider "kein = nicht + ein"

[YosukeOshida]

Eine Frage, darf man sagen: "Ich habe nicht ein Auto"?

[Renato_MOliveira]

This "kein" exercises are quite frustrating! "I don't have any car" cannot be considered a wrong answer...
Maybe "I do not have a car" translates better what they mean in german but still... I can't understand why this is not a valid translation.

[CoryButler]

Maybe it's just me, but when I hear "I don't have any..." I expect a plural noun. So, " I don't have any car" sounds odd, while "I don't have any cars" sounds fine. Still, that would be "Ich habe keine Autos" in German. Maybe that's why your translation isn't accepts.