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What is the number one DTC code for failing OBD vehicles?
A) P0168, Fuel Temperature Too High
B) P0682, Cylinder 12 Glow Plug Circuit Open
C) P0420, Catalyst Efficiency Low
D) P0447, Evap Vent Control Circuit Open
E) B0279, DFTR Too Low
C) P0420, Catalyst Efficiency Low