When the car leaves the factory the first two key slots are used for the transponder codes (sometimes the first 3, on earlier cars). These will be marked as used. It's really just a matter of selecting an unused slot. Here's a screen shot of the BIN.
When a request is sent to the official route to have a transponder programmed the next available slot will be used, since the original factory data is on file. However, the official source will not have any data regarding third party transponder programming - this can however be seen from the BIN.
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Rover 75 Saloon CDTi Contemporary SE +pack
Last edited by ceetdm; 15th April 2024 at 07:41..
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