I have a 2001 nissan almera. I'm having trouble with my keys. I was using the same key all the time until yesterday when it stopped working. Since then I used the 2nd key and the button worked once and now that has stopped working too. I have gone through the programming process and managed t re-programme both of the keys but still when I press the buttons on the key they don't work. I can use the key no problem in the door and the car starts ok, but would like to be able to lock the car via the button again. Anyone have any ideas on what it might be? Any help would be appreciated.