[Status: Resolved] 2000 Mercury Sable immobilizer module mismatch - how to fix?

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Need the key code to program a replacement key for my 2000 Mercury Sable

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Trying everything I can to get the key code for my 2000 Mercury Sable.

Finally, something that might help with my 2000 Mercury Sable's key code issue!

Appreciate any advice—my 2000 Mercury Sable won’t recognize the key.

Crossing my fingers—really need this for my 2000 Mercury Sable!

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Security Systems
A flashing security light often indicates an immobilizer issue. Solid light suggests the system is armed but not recognizing your key. Causes: faulty key chip, damaged antenna ring, low battery, or system needs reprogramming.
Key Programming
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Lost Keys
1) Contact a locksmith who specializes in automotive keys or your dealership 2) Provide proof of ownership (registration, title, ID) 3) They'll either cut new keys by code or reprogram your car's system 4) This is expensive ($200-$800) as the immobilizer may need resetting.
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