You are able to program a 2010 MAZDA3 remote head key by yourself if you have two working keys (or keys that start the vehicle). The new remote head key will first need to be cut to match your original at an automotive locksmith or the dealership. Once the remote head key is cut, you can use the printed programming instructions that we send to make the remote key work for your 2010 MAZDA3 The instructions are very easy to understand and can be performed in less than a minute. If you only have one working remote head key or you?ve lost all working key for this vehicle, the programming can only be done at an automotive locksmith or dealership. This remote head key comes with a new battery installed and is tested for functionality before sending.