The 'code' is the VIN, Vehicle Identification Number, from that the dealer and some locksmiths can look up the REAL code and set their puncher and make you a key. They punch a new key instead of using one of those grinding wheel key duplicators like at the hardware store. A punched key is more precise than a dupe, which can be a disadvantage if the pickumup is very old and the key and tumblers have worn to fit each other. The VIN is on a small metal plate on the drivers side dashboard right up against the windshield. Sometimes it is hard to read.I aint for sure about Rangers but some VINs are also on a plate on the engine side of the firewall, on a sticker on the bottom of the hood or on the cross member over the radiator. Depending on your state the VIN may be on your safety/emission inspection sticker or receipt, it is also on your license tag receipt and/or registration sticker. It will definatly be on your title and that is something you will need anyway. You will need your legal photo ID ( driver's license) and a title with the same name before they will make you a key. Otherwise you could just walk down the street collecting VINS and have a lot of keys for a lot of cars. At least you are supposed to have the title and ID and name match. I have had to have two keys made over the years and neither time did they ask for the ID, I once had an actual title and once a two year old license tag receipt. I guess I looked trustworthy. And if you were to ever see the way I look, you would shudder for the security of your vehicle. " Hey, BillyFred! If I drive this lil truck off the bluff into the lake, you reckon she'll float long enough for me to get out?"