Could be a couple things. Is it a factory original key? If so, it would have a code stamped on it. The code should be something like E####. It it is worn down, it will be hard to use in your door and trunk.
Is it the valet key? See if it locks and unlocks your glovebox. If it doesn't, then you have the valet key.
If you scan a picture of your key and send it to me:
jjens[email protected], I can cut you a key that is the same specifications as a factory original.
I work for Professional Lock & Key in Fredericksburg, VA. If you don't believe me, you can call me at work to verify this information Mon-Fri 8:00am-5:00pm EST.
(800) 373-2340
I have given this offer before. I can cut you a key for the cost of the key blank and shipping. The blanks are under $0.30 each and shipping depends on your location.
Offer is open to any 3SI member with a key that is getting worn down and not working right.