I think the important thing right now is to answer the question - what happens when you walk away from your car with your key in your pocket?
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What if you leave your car running and walk away?
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What if you leave your car unlocked and walk away?
Does the car stop the engine and lock itself? Does it just sit there and do nothing?
Without these answers, I really shouldn’t suggest a solution. If we can get these answers, I could outline a project or maybe even design a kit for this application.