If you live in the area, don't leave your vehicles outside. If that is not an option, do not leave food or anything that might smell like food, e.g. empty bag of french fries or burger from fast food.
They are very adept at just opening the doors. Even locking your car may not be enough. A large bear can break in by pulling down on the top of the door until the window breaks. If they decide to enter, there is a decent chance that there will be significant damage to the interior.
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