How to write this?

Hi. Let us pretend that someone has been asked to correct an English sentence. How should he/she phrase his correction part ? (Please see below)

Someone (not him/her) wrote the incorrect sentence below. Please note it has no period at the end.

He went home on car

How should he/she write this?

I would write and punctuate "He went home by car."

Or

I would write and puncutate it as "He went home by car."

Or any other?