i just replaced mine for the same thing about 2 weeks ago, its the entire lock assembly needs to be replaced ive talked to atleast 5 other crossfire owners who have done this the part runs about 260 list and when you order it with your vin number it comes with an extra key allready in it, it will match your existing one, the only thing is that the new key does not start the car only open the doors the glove box and click your ignition all the way but it doesnot have the sensor needed to start the car it takes about 2 hours to replace the entire thing but after that it good as new.