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When I purchased my 2018 Z06 used, it only had one FOB. The dealer ordered a second one for me but it now comes up as FOB #3 and I can not get the previous seat to work. Any suggestions?
The dealer ADDED a fob which assigns the next fob number, in this case #3. Memory is only linked to #1 and #2.
You need to use the LONG method described in C7 General | Sticky Threads or "Programming without Two Recognized Transmitters" in your owner's manual. This also unpairs the missing fob. You can download a pdf version of your manual in C7 General | Sticky Threads.
The dealer should also have provided a cut metal key. If not, ask them for the key code #. There is a vendor on ebay that will cut you a metal blade key from the key code or photos...