I've been browsing the CPO car listings and have noticed that for the San Francisco area, out of 25 cars listed only one is shown as having Parking Sensors. Then I checked the five most expensive CPO cars shown for the Los Angeles area and none of them are shown as having the Parking Sensors option. That seems highly unlikely. I suspect a glitch in the software backend that runs CPO database driving those listings. Also, the location filter drop down menu does not "maintain state" when you return to the main Pre-owned page after viewing an individual listing. In my browsers the San Francisco area comes up by default. If I select a different area and then view an individual car page in that area, and then hit the back button in my browser it goes back to the San Francisco area. This makes viewing individual cars in other areas rather tedious. And the location filter drop down menu needs an "All regions" choice.