Program a transponder key?

You need an original to program a new one, otherwise the dealer needs to do it should cost about $130.00

Hello. Thanks for the donation. Much appreciated

If you wired the cars battery the wrong way it is possible you have damaged the battery is it holding a charge? It is also possible you could have damaged the PCM/ECU.I would check all fuses and try and get the PCM/ECU to give you a fault code reading? Then follow the steps below. Hope this helps ! Let me know.

Key Programming Using Diagnostic Equipment
NOTE:This procedure is used when a customer needs keys programmed into the system and does not have two programmed ignition keys available. This procedure is also useful when programmed ignition key(s) have been lost or a new ignition switch assembly as been installed, and it is desired to erase key(s) from the passive anti-theft system (PATS) memory.

NOTE:This procedure will erase all programmed ignition keys from the vehicle memory and the vehicle will not start until two keys have been reprogrammed to the vehicle.

NOTE:Two PATS encoded keys with the correct mechanical cut must be available to carry out this procedure. One or both of them may be the customer's original keys.

NOTE:If additional keys are to be programmed, refer to Key Programming Using Two Programmed Keys. If the remaining keys are with the customer and are not available with the vehicle, then instruct the customer to refer to the Owner's Guide under the "Programming Spare (SecuriLock(R) North America, Safeguard(R) U.K. Or PATS for all other markets) Keys Procedure" for instructions on programming the remaining keys.

Turn the ignition switch from OFF to RUN.
Using the diagnostic tool, follow the SECURITY ACCESS to obtain security access. For additional information, refer to Anti-Theft Security Access.
From the diagnostic tool menu, select IGNITION KEY CODE ERASE.
NOTE:Do NOT select any additional commands from this menu.

Turn the ignition switch to OFF and disconnect the diagnostic tool.
Insert the first encoded key into the ignition lock cylinder and turn the ignition switch to RUN for three seconds.
Insert the second encoded key into the ignition lock cylinder and turn the switch to the RUN position for three seconds.
Remove the second encoded key from the ignition lock cylinder.
The vehicle should now start with both ignition keys.
Anti-Theft Security Access
NOTE:The security access procedure is utilized to obtain passive anti-theft system (PATS) security access. PATS security access must be granted to erase ignition keys, enable/disable unlimited key mode, and enable/disable the spare key programming switch (PID SPARE_KEY). The security access procedure invokes an inherent 10 minute time delay prior to granting security access during which the diagnostic tool must remain connected to the vehicle. Once security access has been granted, a security access command menu is displayed which offers various command options.

NOTE:Once security access has been granted, multiple security access commands should be executed (if necessary) prior to exiting the command menu. This avoids the carrying out of an additional security access procedure and the associated 10 minute time delay.

From the diagnostic tool Ford Service Function (FSF) card, enter PCM. Select SECURITY ACCESS. This procedure will take 10 minutes to carry out, during which the ignition switch must be in RUN and the diagnostic tool must be connected to the vehicle.
After the 10 minute security access procedure has been completed, a new menu will be displayed with command options. Select only those functions necessary before exiting out of this menu. Once exited out of this menu, the security access procedure must be repeated again to carry out additional commands.

You need to enter the security access menu by following the directions at the very bottom of my last post and erase the 2 keys from the memory then programme the 2 new keys. You must erase the old and have at LEAST 2 new keys to be programmed