Can another owner of an Impala use their key on my Impala?
No, it would be a one in a million chance that some else's key would fit your car...not to say it couldn't happen, but the chances are slim....
Their key would fit in the slot and that's about all.
Even if the other person had the same key code as you they wouldn't be able to start your car. The car would not recognize their transponder key and the security system would shut the car down. HTH. -Jim
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