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2000 7.3L throwing PO478 code

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03-21-2007, 10:03 PM	#1
Dan Kosek AF Newbie Join Date: Feb 2007 Location: Armada Twsp., Michigan Posts: 18	2000 7.3L throwing PO478 code My ses light came on . I'm running a superchip on the lowest setting I think its 70hp for a year now . It has 134K miles on it and runs great. The PO478 code reads Exhaust Pres Ctrl Valve High Output. Its also throwing a PO470 code which reads Exhaust Back Pres Sens Circ Error. Has anybody dealt with this before?

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