You are able to program a 2003 Buick Rainier Key by yourself if you have one working key (or key that starts the vehicle). It will first need to be cut to match your original key at a local automotive locksmith or dealership. Once the chip key is cut, you can use the printed programming instructions that we send to make the key work for your vehicle. The instructions are very easy to understand and can be performed in less than a minute. If you have lost all Keys for a 2003 Buick Rainier you will need to contact a local automotive locksmith or dealership to discuss your options.