Checking by part number is too make absolutely sure.
I believe the way the RKE keys divide up is one key will cover several models but NOT all models. And different keys for other models might look just like the other keys that don't work for it. If you just picked out a key that looked like yours, it might NOT work, it would only work with some other Dodge models, etc.
So, if the key looks like your's and the auction stated it was for your year Jeep Commander, then I'm sure you'll be ok, unless they were lying.
The way I understand the RKE key system to work, there is a Wireless ignition module (WIN) that talks to the RFID chip and identifies it, it stores its identifier and the identifier for all keys its programmed to work with. The way to program it is with the dealer wiTech tool that makes a record of it over the internet to the Corporate database. I'm NOT sure if there is something in the RFID chip that gets set by the programming process, but they make it clear once a RKE key has been programmed for a vehicle, it can never be programmed again for another vehicle.
In 2010 Chrysler eliminated the feature for the owner to make new keys themselves. Prior to that, and you have a 2008, the owner can program a new key themselves if they have two keys already programmed to the car. The procedure is in the O.M.
So, once you get this key made, I would pick up another one off ebay soon and use the owner key copy feature to make a third key. That way if you loose a key in the future, you'll still have two to make another copy and avoid all this hassle again.
And one more thing to keep in mind, usually there is a limit to the number of keys that can be made for the vehicle, i.e. it can't store more than a certain number of keys and usually you can't erase the old keys (although I've heard they may have changed that). But its usually 7 keys that you can make, if you're into needing your 8th key is when you might run into a problem.
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