Can you just replace the key for a 04 murano?

Yes, you can replace the key for a 2004 Nissan Murano, but it may require reprogramming to ensure it works with your vehicle's ignition and security system. It's best to obtain a replacement key from a Nissan dealership, as they can provide the correct key and handle the reprogramming. Alternatively, a qualified locksmith with the right equipment may also be able to assist you.