We are not allowed to ask whether somebody has a car or not.
The better question is, "Can you arrive on time to the work site?"
Some jobs that recruiters have may need you to visit different company sites. In Southern California, USA, public transportation sucks, so you need a car to get to most places. If you don't have your own transportation, the recruiter will restrict the jobs for you to those that can be accessed via public transportation or are close enough to use public transportation.
Doesn't sound like a scam. Sounds like a recruiter compiling job search attributes about you.