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My Hino started taking longer to regin and couple days ago the light popped on to regin and i pushed the button and it said it was reginning but it ran for over a couple hours and light was still flashing and it was still at high idle. What should I check first? Thanks for the help

Trying to find out what P200c means and why DPR check light is on. Truck going into regin and useing def fluid.What do I need to check or service to correct this problem..