The Used Car Listings functionality was a big push at Carfax. As such, the consumer facing app was completely redesigned to make this the primary focus while keeping the older vehicle history focus as a subsection of the app.
The app allows you to search for used cars in your area using information that is unique to Carfax as the search criteria. This information includes the number of accidents reported, existence of service records, number of previous owners and if the car was a personal use vehicle or a rental.
I worked with a small team of three other people where we each had equal responsibility for the functionality and success of the app.
Find it on the App Store.