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Why would the antitheft system randomly sound off

(1999 Ford Ranger)
in Louisville, OH on January 23, 2011
It goes off anywhere from a few minutes to a few hours after the truck is locked with the remote .
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Popular Answer
on January 24, 2011
Each sensor must be checked - door ajar switches, etc. One of them is failing randomly telling the module that an entry is occuring. Testing will be required.
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