What causes it?
How high? Do you have a check engine light on?
SOURCE: 2003 BMW 330xi has strong vibrations at high speeds
most likley a bent rim on the front or a badly flat spoted or out of balance wheel
SOURCE: Wont start 2003 bmw 330xi
Remove battery terminals and clean both posts and terminals
with sandpaper until you see shiny metal. The black coating is lead sulphate which has a high resistance to current flow both into and out of the battery. Also check the battery in you key as the immobiliser may not be reading it.
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