The key itself is not what is programmed. The onboard computers have to be flashed to recognize the new key.
The keys that are made by places like Wal-Mart and Home Depot are actually CLONES of your existing key, and WILL NOT work for programming a third key, because the computer sees those keys as the same key that you started with.
The last I checked, local dealers around here want roughly $100 to make a new key and flash the computer.
Keeping an extra key or two is a very good policy. The chips (actually an RFID module) in those keys have been known to fail. I was at a parts store one day, and as I was about to leave, I saw a group of people around a late model Expedition. I stopped to see what the problem was. They said the car would not start. I said "let me see." Sure enough, the starter spun but the engine would not fire. I asked the owner if he had a spare key. He had one, so I said "try that one." As soon as he attempted it, it fired right off. Seems the chip had failed in the other key.
Programming in a new key requires TWO DIFFERENT keys with RFID modules in them.
The entire system consists of a PATS module (Passive Anti-Theft System), a RAP (Remote Access Personality) module, a keyless entry module, and the main PCM. At least in a Ford. All of these modules need to communicate with each other for the system to function and allow the car to start.
Hopefully, somewhere along the line, there will become available a means to eliminate the anti-theft system on older cars that are no longer targets of thieves. Otherwise, the whole key thing will send a lot of otherwise good cars to the junkyard.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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