Question about 2001 Honda Accord

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Po401 code and p1399 code on a 1999 honda accord

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Posted on Jan 02, 2017

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SOURCE: po401 lost of power

most likely a bad dpfe sensor

Posted on Oct 07, 2009

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SOURCE: check engine light is on

Go to google & type in ---OBD2 Codes
1998 honda accord PO420 etc

Posted on Mar 02, 2013

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1 Answer

Diagnostics code po401 honda passport not shifting


code p 0401 refers to exhaust gas recirculation valve (EGR) system insufficient flow detected ====causes --hose leak/blockage --basic setting not carried out (if applicable)--wiring--EGR valve --EGR solenoid---ECM
has little to do with not shifting unless the leak is affecting the vacuum actuator for the transmission
so check for vacuum leaks in hoses in the engine bay

Jul 16, 2016 | 2001 Honda Passport

1 Answer

Using my OBD II on 2000 honda prelude trouble codes PO401 & (PO401 pd) all reads MIL on, monitors, 1 INC, EVAP, 7 ready, MISFIRE, FUEL, COMP, CATLYST, 02 sensor, 02 HTR, EGR. Will be cleaning out EGR, BUT...


I would start with whatever is causing the misfire. That seems to be the core of your emissions codes. Putting all codes together it seems to be clogged injectors vacuum leak. Seems to be causing stalling too.

Jun 09, 2017 | Honda Prelude Cars & Trucks

2 Answers

Ok i have 3 code po401 andp1456 and p1491 and a smell like exhaust fume


Us Google & put in your vehicle
followed by OBD Codes PO401 etc

All the codes,solutions & all you will ever
need to know including a fix is on google
or you tube video

This is just a social forum to point you
in the right direction, or we have to look
up the answers for you

Mar 05, 2013 | 2000 Honda Accord

1 Answer

Check engine light is on


Go to google & type in ---OBD2 Codes
1998 honda accord PO420 etc

Mar 02, 2013 | Honda Accord Cars & Trucks

1 Answer

I have a 1997 chevy lumina. i had 2 coded before, po420 and po401. i changed the egr valve, and now the po420 is gone. i just replaced the egr tube, cleared the codes, and now the po401 is back. car sounds...


Well, the po401 is saying is that the egr valve has restricted flow. After changing the egr and the tube, something else is causing the restriction. a more thorough diagnosis is recommended. The po420 code sounds like a possible catalyst failure or an o2 sensor failure.

Oct 16, 2010 | 1997 Chevrolet Lumina

1 Answer

Check engine light, code PO401


Check the e g r position sensor .

Jun 13, 2010 | 2000 Honda Accord

2 Answers

How to repair p0401 code for honda accord 98


The code is for a restricted EGR valve. You will need to take the valve off the manifold and clean out the ports.

Mar 26, 2010 | 1998 Honda Accord

1 Answer

2004 Mercury Monterey 70k CEL code PO401


po401 egr flow insufficient vaulve could be stuck or disconected

Mar 02, 2010 | 2004 Mercury Montery

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