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the most common cause of getting all of these warning at once would be a voltage issue or failed control module.
It is unlikely that all of these systems are independently faulted at the same time.
ultimately the faults need to be read from the vehicle and the proper test plans carried out to verify the underlyinig cause or causes. If a BMW main dealer has the vehicle, they will be able to diagnose the cause easily.
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this means that the computer (control module) that controls the engine is wet and needs to be replaced
no this is not normal, water is not supposed to get on the engine computer.
um, no? not at all.
either the car is in warranty or not. if not in warranty, it is up to BMW whether or not they wish to contribute to coverinig the cost.