Q: I keep getting a "no key" warning

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I can lock/unlock door with button on door handle but key fob want lock/unlock doors or trunk. It also want start car or turn over dash says no key. I changed fob battery and put in key fob slot to bottom left of steering wheel and its still saying no key and want start or unlock doors etc with fob

My car has 92000 miles.
My car has an automatic transmission.

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