There are effectively 2 ways you could handle this properly:

1. Consolidate all of those duplicate pages into one page; keeping these listings one a single page and using a gallery / ajax / etc. to bring up one specific car at a time.
2. Choose one page from each set of duplicates as the base page, and place "rel-canonical" tags in the duplicates.

Option 2 is likely the better of the two in terms of SEO and your business, but both are technically viable options.

While it won't necessarily have SEO implications, I'd suggest steering away from duplicate headings, if only because it can be redundant for anyone consuming your content. It could be argued that, this sort of duplication could reduce your ability to diversify your keyword usage.