It was mentioned to me by the BMW dealership that BMW does not CPO their cars that have been involved in a collision. So either carfax is wrong or its not a BMW CPO, ultimately it all depends on what your intentions are for your X(i.e. will you keep for the long haul, trade in 3 yrs etc). Looks could be deceiving, if it has been in an accident carfax does not tell you the extent of damage. I personally would look somewhere else due to the unknowns, plus for $45K I'd look for a 4.8.

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The Marines already have a few good men
...............The Navy CORPSMAN