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Dan, Technician
Category: Ford
Satisfied Customers: 24573
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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2003 powerstroke showing code p0404 & po405 what do they

Customer Question

2003 powerstroke showing code p0404 & po405 what do they show. Thank you very much !Truck runs great 200,000mi concerned about egr system
Submitted: 1 year ago.
Category: Ford
Expert:  Dan replied 1 year ago.

Hello, my name is***** usually means the EGR valve is sticking and is a very common problem. I would go ahead and replace the egr valve at this point. To know for sure you would need a scan tool capable of opening EGR to see if it makes engine run rough, if not then that would verify it is not opening and needing to be replaced. Let me know how it goes or if you have more questions, thanks.