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This may not be your problem, but when my key would no longer lock/unlock the doors remotly, I switched to my wife's key and everything worked just fine. After some detective work online I found the solution: using my unresponsive key in the ignition, I took a half hour drive up I-75 and back (at speed) and that was sufficient to recharge the battery within the key. I simply wasn't driving the car enough to keep the key charged enough for remote operations!
Art
 
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