code p0401

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11-17-2009, 01:06 PM

fordalways

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Join Date: Nov 2007

Posts: 11

code p0401

Installed new EGR valve and code went away. Next day code came rite back.
How do I resolve this issue. thnxs

11-18-2009, 06:17 AM

way2old

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Join Date: Jan 2006

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Posts: 1,234

P0401 is insufficent flow. Usually it is the DPFE sensor, or the passages under the EGR valve are plugged with carbon.

12-09-2009, 12:58 AM

glikark09

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Join Date: Oct 2009

Location: Germany

Posts: 10

code p0401

my 91 integra flashing code 5 everything says MAP sensor, if anyone knows about this help me out what are somethings that happen and what caused it?thanks

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