Google Wallet turns your Android phone into a complete digital wallet, storing everything from payment cards to boarding passes in one secure app. Whether you're paying for coffee, hopping on a bus, ...
Adding a car key to an iPhone requires going through the manufacturer's app and then pairing the phone to the car via NFC.
Storing car keys on Android requires a wallet app such as Samsung Wallet or Google Wallet, and usually requires a pairing process that may differ between cars.