CEL P0401 - Insufficient EGR Flow - Honda-Tech


CEL P0401 - Insufficient EGR Flow

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Old 02-19-2012, 10:44 PM   #1
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Default CEL P0401 - Insufficient EGR Flow

Hi guys. My 1999 Honda Accord set the CEL P0401 code (insufficient EGR flow). I reset the CEL and it came back a few weeks later (I think it was a warmer day than the previous days). Anyways, I'm getting about 21 MPG city (I know clogged EGRs can reduce fuel efficiency), is that particularly low?

I've seen some tutorials/videos (none specific to my model). I haven't seen anything that was that good explaining the process. Also I've seen people clean out their whole throttle body / intake manifold which looks pretty complicated.

It doesn't look like I can reach 1 of the 2 bolts (the one closer to the manifold) without removing other parts out first. Should I just take it to the shop?
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Old 02-22-2012, 07:20 PM   #2
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Default Re: CEL P0401 - Insufficient EGR Flow

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Old 02-22-2012, 11:45 PM   #3
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Default Re: CEL P0401 - Insufficient EGR Flow

Cleaning helps but in the end, I had to replace the EGR altogether to make my P0401 go away on my 99 accord :/ There's a cleaning procedure that requires taking off the entire intake manifold. Check that one out.
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Old 02-23-2012, 06:33 AM   #4
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Default Re: CEL P0401 - Insufficient EGR Flow

already stated in one of the 4 links i posted

be sure to rule out the passageways and vacuum hoses first before replacing the valve

try blasting the valve itself with some carb cleaner as well
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Old 02-23-2012, 04:58 PM   #5
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Default Re: CEL P0401 - Insufficient EGR Flow

i had the same problem on my 96 i replaced the egr and that wasnt the problem so talked to a guy that helps work on my cars and we found out that the egr ports on the intake under the fuel rail were full of carbon
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2000, 2002, 2004, 99, accord, code, egr, flow, homda, honda, insufficient, lx, p0401, po401, valve

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