When I got this Avalon I was able to add a new key and one remote but not a second remote. I suspect it may have had the limit of remotes programmed ( I heard 5) over the years. Now the one remote doesn't work. Can Techstream be used to remove old remotes (not keys) and program new remotes? Any how-to's? I haven't found anything other than the cars with the combo of key and remote. Thanks.