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Sorry if this is a re post. I attempted to replace my ECM (swap) in my 2002 Discovery petrol twice due to constant front 02 sensor fault codes (replaced sensors twice) .Now when I installed the new (used) ECM the car starts for a second then shuts off. Then I tried another ECM and it did the same. So I put the old ECM back in and it runs but with the codes Both ECM replacements are of the same year, SAI setup and part numbers What is happening here and what can be done about it.
 

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Ecm needs to be programmed.
Likely a security lockout issue
 
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