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Derric Michael West Posted on Dec 03, 2015
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How can fix the problem po401 obd code

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Stan Ford

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  • Cars & Trucks Master 3,131 Answers
  • Posted on Dec 03, 2015
Stan Ford
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Joined: May 16, 2011
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You have to find and fix the fault the code relates to , delete the code then test drive to make sure the code does not come back if it does the fault is not fixed.

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0helpful
1answer

1998 ford f150 4.6 engine i have a computer code PO401
codes are OBDll and are available on line free
https://www.yourmechanic.com/article/p0401-obd-ii-trouble-code-exhaust-gas-recirculation-flow-malfunction-by-jay-safford
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May 08, 2022 • Ford Cars & Trucks
0helpful
1answer

I have a 2004 Hyundai Santa Fe 3.5L. Diagnostic shows: PO401, P0441, P2125, P1193. Im trying to pass smog test and check engine light is on.
these are what your codes are https://www.obd-codes.com/p0401 https://www.obd-codes.com/p0441 P2125 Throttle Pedal Position Sensor Switch Circuit P1193 Electronic Throttle System Limp Home Low RPM
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Nov 13, 2018 • Hyundai Cars & Trucks
0helpful
1answer

PO401 trouble code
P0401 OBD II Trouble Code

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Mar 30, 2015 • Cars & Trucks
0helpful
1answer

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.
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Jun 09, 2017 • Honda Prelude Cars & Trucks
0helpful
2answers

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
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Mar 05, 2013 • 2000 Honda Accord
1helpful
1answer

Code po401
A code P0401 most likely means one or more of the following has happened:
  • The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
  • There is a blockage in the EGR (tube), most likely carbon buildup
  • The EGR valve is faulty
  • The EGR valve may not be opening due to a lack of vaccuum
Possible SolutionsIn fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM'sicon1.png & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
  • Clean out the EGR valve and/or tubing to remove deposits
  • Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
  • Replace the DPFE sensor (with a good quality / OEM one)
  • Replace the EGR valve
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Nov 04, 2012 • 2003 Hyundai Santa Fe
0helpful
1answer

Service engine soon light flashes only under accelation obd code po401 car shakes and stumbles and has limited power
EGR is stuck open, but a flashing engine light can be a misfire code also detecting a rich condition, right back to the egr.
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Nov 09, 2011 • 1999 Mitsubishi Eclipse
0helpful
1answer

OBD II code PO401 EGR Problem? Change Solenoid and pressure sensor; egr valve working good. Pressure sensor have 5 volt reference and ground; solenoide have 12 volt in red cable and negative is ok. Ford...
The EGR solenoid hardley ever goes out..Probably a flow problem,,If its the 4.2 its more than likely the EGR ports...Please list the engine..I may know what to tell you to fix it..
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Sep 14, 2011 • Ford E-250 Cars & Trucks
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1answer

Check engin light code po401 what does this mean.
P0401= Exhaust Gas Recirculation "A" Flow Insufficient Detected
for more info pls refer to this link http://www.obd-codes.com/p0401
this isn't really nothing major to worry about it just a emission code
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Feb 27, 2011 • 1998 Toyota Camry
1helpful
2answers

Ford explorer 2002 v-8 code po401 low flow on obd-2
Replacement engine put in with 51000 miles and now the engine light is on and the speedometer goes from 50 to 0 and then jerks
Read full answer
May 31, 2008 • 2002 Ford Explorer
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