We found out the hard way about the key fob reset under the cup holder. We have a 2019 Expedition and 2017 F250. Expedition was at Rite Aid, door wouldn't unlock, finally did, then wouldn't start, said key not detected. Called husband, he came with F250. Finally got Expedition started and then F250 wouldn't start, same thing, key not detected, couldn't get it started, called AAA. While waiting googled it and saw that you could reset key fob by placing it in certain cupholder (after taking out top part of cupholder). Did that and it started right up. Neither battery was dead, something at that Rite Aid was interfering with signal. Employee at Rite Aid said we weren't first to tell him that their vehicle did that in their parking lot. We never park at the front of the store now, park on side, hasn't happened again. Weird.