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2011 Hyundai Sonata Car sitting for long period. New car battery was installed, new battery in key fob. Car shows no key detected. Will not work on door locks

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  • Welcome to Motor Vehicle Maintenance & Repair! Commented Mar 5 at 23:15

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I'm sure it will require the fob to be re-paired with the vehicle ... not "repaired" but to be "paired again". (Sorry for being pedantic ... just wanted to be clear.)

According to this website:

There is no onboard programming procedure for this vehicle. This vehicle requires special equipment be connected to the vehicle to program the keyless remote. Try a locksmith before the dealership, they are usually 50% the cost.

I've not heard of vehicles losing their pairing because of losing the battery, but this seems the most likely culprit.

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