Code p0404 after dpf reinstallation - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 11-27-2012, 10:31 PM Thread Starter
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Code p0404 after dpf reinstallation

I put it back on today and p0404 has come up twice if the egr is stuck open is it ok to run still? If I take it back to the dealer for warranty work do you think they will hassle me? Clearly you can tell I was deleted my dpf got a little rusty in spots and the bolt heads look like they have been on and off? It's the only code that has came up but it came on after 10 mins of driving
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post #2 of 5 Old 11-27-2012, 10:40 PM Thread Starter
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Need help guys how urgent of an issue is this should I tow the truck to the dealer tomorrow? It still drives fine just real slow and only boosts to 28psi
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post #3 of 5 Old 12-10-2013, 12:45 PM
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Same issue. I ran the mini max and dpf delete for about 9 months on the 275 tune. Yesterday, I put the dpf back on and and returned the truck to oem tune. Now I am throwing a code p0404. Is it OK to drive? If the truck has less then 100k on it, will ford fix it under warranty?

2008 King Ranch CC/LB
DPF Delete, S&B CAI, H&S Mini Max, EGR valve and cooler delete, new downpipe, level Kit, double steering stabilizer, 35's on 18's, Bilstien's, and a Valentine V1
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post #4 of 5 Old 12-16-2013, 12:05 PM
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Take it in and say the check engine lamp is on.

Driving with the egr hung open is going to suck.

Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
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post #5 of 5 Old 01-02-2014, 01:41 PM
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Take the egr off and clean out the coke real good with carb cleaner, scrapers, screwdrivers, brushes. It is probably totally seized with baked rock hard coke, at least mine was. I had to remove the entire housing b/c the valve wouldn't come out and I didn't want to break it.

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