Tried the search function and read for a half hour, but did not find my particular issue. I just changed the batteries in my FOBs, but the dash still says "No Key". These are the FOBs that came with the car. The car will start by putting the FOB in the slot. Do they need reprogramming or is it another component that's gone bad.?

 

Nevermind! I had the batteries in upside down.

 

^^
Whenever I am about to change batteries in any device after opening it up, I notice the battery orientation and place the new ones the same way prior to removing the old ones.
Glad you found the problem