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  • 6.0L - COKING DEPOSITS DIAGNOSTIC - EGR DTCS P0401, P0402, P0404, P1335
Publication Date: December 22, 2008

2003-2005 Excursion
2003-2007 F-Super Duty
2004-2009 E-350, E-450, E-550

This article supersedes TSBs 08-2-7 and 07-21-9 to update the Service Procedure and Part List.


Some 2003-2007 F-Super Duty, 2003-2005 Excursion and 2004-2008 E-Series vehicles equipped with a 6.0L engine may exhibit white smoke, black smoke, lacks power, exhaust odor, surges and/or exhaust gas recirculation (EGR) diagnostic trouble codes (DTCs) P0401, P0402, P0404, and/or P1335 as a result of excessive coking deposits un-combusted or incompletely combusted hydrocarbons. This procedure should be used only if one or more of the components listed below have already been identified as having an excessive coking condition.


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