Transponder Key Blank Fits Toyota 4Runner With Do It Yourself Programming Instructions This is about one uncut transponder key blank with a black plastic head, and the chip included inside the key, tested and ready to be programmed. You can take it to most hardware stores, home improvement centers, or locksmith shops with your working key to cut it and duplicate it. Once you get this new key cut, you can program it yourself. All you need to have is one working key that starts your vehicle. The programming procedure is very easy to follow step by step, and is included with the key. Any question you have, you can always contact us. We stand by our products, and they are guaranteed to work. It Fits 1999 2000 2001 2002 Toyota 4Runner Toyota has limited the number of keys that can be programmed into many Toyota vehicles, and only 3 workings keys can be programmed to a vehicle at any one time on certain models. If you try adding an additional key to a vehicle containing 3 Transponder Keys already programmed, the vehicles On-Board computer may not accept the new key. Even if you lost one of the copies, the cars computer still has it in memory. If this is your case, you may not be able to program more copies, unless you delete them. Theres a procedure to do it, and if you bought this key from Bartolete Keys, you can contact us anytime to get it at no charge by email.