Mitsubishi Lost Key Replacement Mitsubishi car keys have special features that stop theft and make it difficult for thieves to gain access to your car. These keys aren't available at your local home improvement store. They can only be made by an experienced locksmith with cutting and Mistubishi Galant programming techniques. Your Mitsubishi key fob could not be working due to a problem with the battery. Transponder Keys If you have a mitsubishi key programmer Eclipse with a transponder chip, then you have to get the key re-programmed. This procedure should be done by an automotive locksmith or through your dealership for cars. The chip is a tiny piece of metal that is located in the middle of the key that transmits a message to the immobilizer of your vehicle. These signals inform the car if it's the correct key to start the engine.