Procedure to program replaced transponder chip needed?

1999 MERCURY COUGAR
300,000 MILES • 2.0L • 4 CYL • 2WD • MANUAL
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WISH30
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Dears, I ordered a new transponder chip and would like to replace the existing one in the key.

What is the exact and correct procedure to program it directly on the car? (because every model have little bit different procedures)

I have only one key, which looks like the one attached on the photo (downloaded from google), and the transponder will not be as second, but as a master (in this only key).

Thanks in advance.
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Apr 29, 2024 at 7:12 AM
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STEVE W.
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Please see earlier post - Recap, To program extra keys you need 2 working keys unless you have a scan tool.
Apr 29, 2024 at 12:27 PM
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WISH30
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I have two of those Bluetooth alexpress extra cheap scans, and as I think they are even not able to connect to older cars. So I will go to locksmith and copy the transponder.
Apr 29, 2024 at 12:51 PM
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STRAILER
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Sounds good, that would be your best bet when it comes to programming keys.
May 1, 2024 at 8:59 AM
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STEVE W.
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Keys can get interesting in programming. Be sure that the smith actually creates a key, not clones a bad one. Have seen that happen.
May 1, 2024 at 12:14 PM
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WISH30
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I already solved the problem tonight. Borrowed an usb OBDII, downloaded Forscan with 2 months free license, after 20-30 tries the car red the bad transponder, clicked program additional key, put the new transponder, and now it works.
May 1, 2024 at 5:30 PM
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STEVE W.
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That program is very handy to have. If you are on reddit there is a FORScan subgroup.
https://new.reddit.com/r/FORScan/ Lots of info on there.
Great to hear you got it.
May 1, 2024 at 6:18 PM