DOC Failure check engine light - Ford Powerstroke Diesel Forum
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post #1 of 6 Unread 07-14-2019, 04:37 AM Thread Starter
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DOC Failure check engine light

Newbie to the forum with a 2011 6.7 102k. Been towing a fifth wheel around the country for the past 20k miles. Check engine light came on and was told by Ford dealer in Florida the DOC needed replacement to the tune of 6k!
Went to a reputable independent in Ocala for a second opinion and they were unable to determine what the problem is. The truck runs fine and there has been no drop in fuel economy. It is a base model XL and I'm not sure if the display shows regeneration each and every time it occurs. The display does show the def fluid is still ok after towing from Florida to Colorado. Is it possible the check engine light is preventing regeneration and the def fluid usage? I've have read about places that will clean the DPF and DOC
to alleviate blockage and soot if that is the problem. Contacted a place in here in Colorado and it can be done for around $650 to $700. More palatable than 6k if blockage is the issue. Any help or suggestions would be greatly appreciated. I am no mechanic.lol. Thank you
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post #2 of 6 Unread 07-14-2019, 11:45 AM
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WTF is a DOC? What is your CEL code?

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post #3 of 6 Unread 07-14-2019, 10:06 PM
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Originally Posted by Old King Coal View Post
WTF is a DOC?
Diesel oxidation catalyst
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post #4 of 6 Unread 07-14-2019, 10:12 PM
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Originally Posted by Turd Ferguson View Post
Diesel oxidation catalyst


Well that would make sense. Thanks!

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post #5 of 6 Unread 07-14-2019, 10:12 PM
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What are the code(s)
Is your tailpipe black with soot? Or is it clean?

If it's black with soot, the dpf is likely cracked.
A plugged dpf will let itself be known through fuel economy/lack of power.
A cracked dpf won't show signs other than black tips and possibly a MIL

Last edited by kaya; 07-14-2019 at 10:16 PM.
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post #6 of 6 Unread 08-12-2019, 05:39 PM
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They most likely saw NOx efficiency values off I prefer to do a single reset on the learned values before tackling a DOC or DPF, heavy loads can skew these values over time I believe the early year models only have one NOx sensor
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