I recently got a second, used, fob to supplement the functioning one I got with the car. I have gone through the steps I found outlined by both Viper and Aedo and am getting some unexpected results. Both fobs can be programmed to do the job, but when I get one done the other does not work. I thought all was lost when I lost the ability on the original after successfully programming the new/used one, but then I went back and reprogrammed the original and the second one failed, that's how I've left it for now. Thoughts?