In most cases a leak from any hose will give you a different fault codes that are not even related. For example, broken line from the crankcase breather valve will give you sevaral fault codes, this condition could throw different fault codes like the crank case sensor or 0174, 0369, 0172, and some more, perhaps you would even get the lights on for the ABS which is not even related to. Unfortunatelly, in this car once the computer DME gets other inputs that are different than a normal disfunction, it will give you unrelated codes.

Be advised that such tubing or lines connected to the crankcase breather valve are difficult to get to it. The complete replacement job will take you about five hours once you removed most of the components from the engine. I did it you can do it, just be patient and label avery part you remove, take pictures to help you putting things back specialy the connectors that are easy to misplace or forget were they go. Good Luck

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X5 The Lost Mechanic