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Back in the late eighties and early nineties it wasn't difficult if you had a Ford product. My escort key would unlock another same color Escort in the parking lot. My Aunt was able to take the Mercury to the mall but was locked out as she had her husband's keys to his Ford (I forget the model)

However now with the new chipped keys that is far less likely. Yet at the same time we introduce new means to communicate with cars its likely without some sort of industry standards there will be holes as manufacturers will not be inclined to pass on lessons learned to others

It happened to a family member recently, for her mid-2000s Ford Expedition. She unlocked and entered a similar looking Expedition before realizing all the stuff in the console wasn't hers.

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