In case your Fast Key does not work

[Shaft]

I apologize if this has been discussed before but found this info in the Mitsubishi website FAQ section.

Is there an emergency key for the FAST-key?
Yes, there is! In the event the battery dies in your FAST-key fob, you will still be able to start your car! First remove the ignition knob "cap" in your vehicle by slightly depressing the sides of the cap. Next, release the emergency key (looks like a "regular" key) from your FAST-key fob: If you turn your key fob over, there is a button on the back of the fob that releases the silver emergency key. Once released, remove the emergency key, turn it around, and place the end of the key (where the ring is) in the key fob. Insert the key into the ignition and turn the engine over. (You must make sure the FAST-key fob is attached/touching the emergency key when starting the engine; the emergency key does not snap into the FAST-key fob so you may have to hold the key and the fob when turning the key in the ignition. Once the engine has started, you can remove the FAST-key fob, leaving the emergency key in the ignition, and place the fob in a secure location.) You can now drive to your local Mitsubishi Dealer in order to have your vehicle diagnosed. You can also find additional information in your Owner's Manual about the emergency FAST-key operation.

For vehicles equipped with a One-touch Start System, you can find additional information regarding using the emergency key in your Owner's Manual.