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Q:

I have a 09 Lincoln MKS, and the key fob won't work to unlock the car. on 2009 Lincoln MKS

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I can open the car manually, but car won't start, turnover, or anything. This has never happened before!
(1) Answer
I'm certain you have already done this but if not replace the batteries in the key fobs. Remove the manual key and pry the fob apart from that end. The battery part/model number is on the battery. I had to bend the contacts in slightly to make the new batteries work. My originally batteries lasted almost 5 years.