"I want to sell my car."

Translation: 我想卖我的车。

[Meeracidium]

我要卖我的汽车？

[NasuSamaruk0]

汽车 is the complete compound form of the word "car". That is also acceptable to include.

[Patrick_Dark]

According to a native speaker, "汽車" doesn't sound good. "車子" was her preferred term for "car" in this sentence.

[cafe_disco]

I wrote "我要卖我的车", and it was marked wrong. But could this be considered correct?

[Sue982688]

Yes, 要 can mean want, but more often implies "need" or "will". That is, it is more certain than 想. I think they should accept 要 but then show you the version with 想。