I read that as zombie car. As in, a car that is a zombie. That sounded cool.
What's the car running on? Blood? You sure, that car is not some mechanical zombie? Or do zombies have a thurst for gasoline, or is their brand of undeadness fermenting their fluids to be burnable in a special car? Yeah, I know, collecting stars to continue to run is not new, and having to collect them to continue to run is not sensical either.
An explanation pulled out of thin air would be this: the car is a modified autonomous taxi, one of the few sturdy builds that survived the zombicalypse. But the payment options could not be deinstalled, so you have to get near people's wallets to trigger nfc payments. Luckily you could at least install the sensor in the armored front bumper.