The three and four button standard Ford square remotes with the FCCID number CWTWB1U331 are completely interchangable.
If you only have a four button standard Ford square remote and your customer has a three button, you can still use the four button, only the trunk option will not work. The same applies the other way around.
Both remotes also program the same way.
- Put your key in the ignition
- Switch it from off to on 8 times
- Press any button on the remote
- Turn the car off
Simple as that!
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