I followed the direction on the manual to a "T", and even followed all the other advices mentioned on this forum like:
1) close all doors
2) wait for hibernation mode of the car to kick in before resetting
3) holding down the "O" button during position 2, going to Position 0 with the button down, and then back to position 2.

FYI, I've been ignoring the message for months now. Now that I've got some time to sort it out, I'm obsessed with clearing it. Pleae help!

PS: I have a 99 E320 Wagon. Thanks.

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89 300CE
91 Supercharged Miata
99 E320 Wagon