Never heard that before with Focus. Unfortunately sounds like some pain in getting it diagnosed but SURELY in this day and age of computers you'd expect the cars to log something.
I support full electronic data recording of all parameters because you'd ifnally be able to prove that something is out of the ordinary if something went wrong, not just prove what went wrong in an accident... use their recording technology against them.
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2012 Mazda3 MPS 
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