How many Keyfobs can one car accept?
Usually at least 3 or more. Are you following the procedure correctly and using the correct fobs?
Normally when you program one new fob, all existing fobs are deleted. You must enter all the fobs you want to use at the same time during the same programing session. Even the old ones that you still want to use. HTH. -Jim
It is true that every time you program one, you must re-program all the key fobs, because the one(s) you do not program will no longer work. This is to keep someone from being able to add a key fob to your vehicle without your knowledge. Here is an article that walks you through how to program them step-by- step: http://www.shareyourrepair.com/2014/09/how-to-program- keyless-entry-remote-for-2004-2010-toyota-sienna.html
Looking for a Used Sienna in your area?
CarGurus has 26,630 nationwide Sienna listings starting at $1,499.
Search Toyota Sienna Questions
Toyota Sienna Experts