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Old 11-23-2012, 10:35 PM   #10
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Join Date: Aug 2012
Fan#: 102548
Location: Austin, TX
What I Drive: 2012 White Titanium Hatchback

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I carried a spare in my suitcase that was wrapped in aluminum foil. It worked fine but only had it in there for a few hours.
I would think that the foil either works or does not and would have not considered that radio signal could leak out if it was wrapped in foil.
Maybe you could test that theory by leaving a key wrapped in foil in the car overnight.
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