If you click on the link above with the red lettering, it will take you to a bunch of YouTube videos concerning the reprogramming of Honda key fobs. The video I watched was for a non push button start, even though the search said push button start. The above first reply was semi accurate for a key start. The video, shows numerous repeats of up to four times of repeating the key on & pressing & holding the lock button. Not sure if yours is key start or push button start. Mine on my 2018 is push button. Last year I had to replace a battery, & over the phone, my Honda dealer told me how to do it, but I can't remember now how I did it. Call dealer service department or check out the number of videos on the link I sent. Good luck! It can be done.