Cant help you much with zero info, i've done many 6.0 rebuilds and egr deletes, in general '05 up trucks will throw the cel, '03-04 wont, just the codes, for cel, yes, remove the blockoff plate, stick the valve back in and plug, the light will go out. The valve wont do anything, but the computer thinks it is. When asking mechanical questions your info is critical, including the last 8 digits of vin#, especially a psd, there Are 3 critical factorymods/changes on 6.0's that date of manf. Dictates your engine arrangement.
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