Here are the backup solutions I now put in place before leaving home — and why you might want to try them if you're traveling anytime soon. AdvertisementBut when stopping for fuel 600 miles away from home, with 1,100 miles remaining, "Key battery low, replace soon" appeared on my car's display. I didn't bring my spare smart key fob, let alone a flathead screwdriver or a replacement battery. The smart lock wouldn't let us lock the door. If it's a smart lock, I ask for a contingency plan in case the tech isn't so bright.

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