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post #3 of (permalink) Old 2nd October 2009
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in the key is a transponder which transmits a unique number to the BMT ( uch ) under the glove box which in turn checks its the same as stored in the engine ecu . When they are the car will start.
Your replacement ecu has a different security numer stored.
Is your car an 8v 1.2?
These ecu 's can be programmed into a "receptive" mode to accept the next car they are plugged into.
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