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i have 2011 sonata that i parked on tuesday to go on vacation. i returned 5 days later to find that the car wont detect the keys. i changed the batteries in the fobs, had the car battery tested, and inserted the key in the override slot and nothing happens. anyone have this problem and or have a fix for it??
 

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How did you test the car battery if the fob doesn't work? How old is the car battery and its resting voltage?

What is the voltage of the key fob batteries? Were either taken for a swim?

The fix is a trip to the dealer for a troubleshoot. You are overlooking something.
 

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I imagine you could use the manual key to unlock the door, pop the hood and pull the battery to be tested :). And yes, to fix it go to dealership to troubleshoot first. Unless you somehow are 100% positive it is that the car "forgot" your fobs, then you could try a locksmith to see if they have the ability to reprogram the smart fobs on a Hyundai. However, dealer would be able to do that and troubleshoot any other issue that could be causing the problem.
 
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