made 3 keys and it wouldn't start" the theft deterrent flashes on?

2006 MERCURY MILAN
96,000 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
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SAMYEHYA12345
  • MEMBER
  • 1 POST
"hi,I replaced 6 coils and plugs, then replaced the crank and cam sensors and then replaced the PCM and made 3 keys and it wouldn't start" the theft deterrent flashes on
Nov 22, 2015 at 8:31 AM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
I suspect when you programmed the keys you used the method attached below which requires two previously programmed keys.

If that is the case, then we are not going to be able to use this method after you replaced the PCM.

Unfortunately, we are going to have to use a scan tool in order to program these keys.

I am attaching this process as well below.

Please run through this info and let me know what you find.

Thanks
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Jan 17, 2022 at 5:36 AM
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