I've just had my 2002 330ci (UK) in to the dealer with the same alarm
problem as you describe. I also had a faulty drivers door lock which was
replaced. I was told the lock might have been the problem but also that the
hood switch was causing them concern and that while it worked they thought
it might be badly seated and that I should monitor it and contact them if
the symptoms continue. The day after collecting it went off at 6.00am so
later that morning I squirted all the spring catches and keeps and then
found the hood switch which I pushed about and prodded a few times. That was
yesterday morning - since then OK!
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