how to import CAD models in 3D studio max with 100% accuracy ?

whenever i import my CATIA V5 models in 3D studio max i face lots of problems with its accuracy and geometry .
Lots of openings are seen on the model which makes difficult to perform many tasks on the model.
i have attached a image of a motorcycle mudguard , many openings can be seen in the inner side (dark region).
please designers ,help me out!!

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