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If you change the Ecu then you need to change the following:
UCH
Key
Decoder Ring
Ignition Barrel
Door locks
Fuel cap
Reason beeing the Key is matched to the Ecu, im not sure about re-configureing the key you have not to the new Ecu, but it will cost you a fair amount to do,
It's really not worth it! I only asked as my cup was remapped... I was thinking I could just swap the ecu over... I didn't even think about the coded keys syncing with the ecu!