You can add your car key to the Wallet app, and use your iPhone or Apple Watch to lock, unlock, and start your car.
To add and use a car key on your iPhone or Apple Watch, you need:
A compatible car. To find out if your car is compatible, contact the manufacturer or your dealership.
iPhone XS or later, or iPhone SE (2nd generation), with the latest version of iOS, or Apple Watch Series 5 or later, or Apple Watch SE, with the latest version of watchOS.
To be signed in to your device with your Apple ID.
How to add your car key to Apple Wallet on your iPhone
Make sure that your car is associated with the account provided by the car's manufacturer.
Open the car manufacturer's app, email, or text message, or use your car's display and follow the instructions to set up a key.
When you're sent to the Wallet app, tap Continue.
If prompted by the onscreen instructions, place your iPhone on the key reader while your iPhone and car pair.
When you add your car key on your iPhone, it might be added automatically to your paired Apple Watch. Or you might see the option to add it to your paired Apple Watch.
You can also manually add your car key to your Apple Watch. In the Apple Watch app on your paired iPhone, tap Wallet & Apple Pay > the Add button next to your car key.