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Corolla Transponder Key Lost

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I would like to know what is the procedure for replacing an immobiliser ecu and programming new keys on a corolla 97, AE111? The procedure i know is to install the ecu and then leave the new key with the ignition on for at least 30 min.

It's not working, the key is not being registered and i have a code 31 (key not registered).

We lost all keys, So i just installed a new immobiliser ecu.. (expensive and sofar useless)...

Any help?

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