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Unlock and start your car with keys in Wallet on iPhone
Some car makers offer the option to control your vehicle with a digital car key. If your car is compatible, you can add this key to the Wallet app on your iPhone.
With car keys in Wallet, you can use your iPhone or Apple Watch to unlock and start your car by placing your device near specific locations. This feature works for up to five hours even after your iPhone battery runs out. You can also use the Wallet app to share your car key with other people.
See the Apple Support article Use your iPhone or Apple Watch as a car key.