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Actuation systems for airbags can vary - some are centrally controlleed where a single actuator sets them all of at once - others have different sensors located at strategic points of likely impact. If it were mine I would look inside the door which suffered the impact. Yes you are right it is wise to ensure components are replaced with new parts - second hand is not advised as it could have been taken from a scrapper (crashed car)and you've no way of knowing if it would work when required. Additionaly there may also be insurance implications.
Currently in madnoel10's garage:
Honda Civic 1.4l