You should be able to reset the immobilizer by inserting the key into the trunk lock and completing a full lock and unlock cycle. You may need to resync the remote, but I cannot remember the keypress to do it.

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.