I am new to forum.I have F-350 with a amsoil cool air intake and a bullydog pmt.I am getting egr code p0483 and a obd 2 test incomplete.The only thing running different is when coasting it almost sounds like the engine is revving up a little.Wondering if I should worry or take it in.It has 58,000 on the engine,thanks for any help!

 

P0483 Cooling Fan Rationality Check Malfunction.

Maybe you are hearing the fan clutch locking up? It would sound like the engine is revving up if it was.