I just did mine 2 months ago, just like this video. No brainer. I think my programmer even came with the additional fob.If you get the Dorman programmer, you have to go thru and pair any existing fobs you have when you pair the new one. For the non working one you have, be sure the check for broken solder on the battery clip, and that it’s got a fresh battery. I went thru this exact thing a few weeks back and the 13732 worked for me.
Here‘s a YouTube video that shows it all...
I needed a back up also. Took 2 minutes tops!
Stay well, Jim