Question about 2000 Ford F150 Flareside SuperCab

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1999 F150 ENGINE LIGHT PO401 LOW FLOW EGR - 2000 Ford F150 Flareside SuperCab

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Dpfe sensor and if over 80k dpfe ports are plugs! your welcome

Posted on Aug 05, 2008

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2004 Chevy Venture. "Service engine soon" light on. Code PO401. I believe EGR passage in plugged. Will GM&#;s Top Engine Cleaner work?


diagnostic aids:
a vacuum restriction to the map sensor--a skewed map sensor reading can cause the PCM to read an incorrect MAP change during the EGR flow test
an engine that is running poorly due to mechanical condition such as worn piston rings, ect. can cause low engine vacuum thus EGR flow test will fail
excessif backpressure of the exhaust system can cause P0401
exhaust system leak can cause an insufficient amount of EGR flow
a restriction in the intake manifold such as carbon deposit and casting flash.

Nov 22, 2014 | 2004 Chevrolet Venture Passanger

1 Answer

Egr PO401


Code 401 is for low EGR air flow. The EGR valve allows exhaust gas to be recirculated back thru the intake and reburned.
The problem could be the EGR valve, the sensor, or a blocked line.

Jun 29, 2013 | Dodge Ram 1500 Cars & Trucks

1 Answer

Po401


Trouble Code: P0128

ECT Sensor Below Thermostat Regulating Temperature

Possible Causes:


Check the operation of the thermostat (it may be stuck open).Coolant level is too low, or the coolant mixture is incorrect.ECT sensor signal circuit has a high resistance condition.ECT sensor is damaged or it has failed.Trouble Code: P0401

Insufficient EGR Flow Detected

Possible Causes:


Base engine problem (e.g., a severely restricted exhaust).EGR vacuum hoses damaged, loose or routed incorrectly.EGR passages or intake passages clogged or restricted.EGR solenoid valve is clogged (carbon), damaged or has failed.TSB 87-65-22 contains a repair procedure for this code.

Dec 29, 2012 | 2005 Chevrolet Impala

1 Answer

I have a 1997 ford Taurus 3.0 v 6 the check engine light is on My scanner shows a po401 low flow egr what is the most commed fix.


EGR Valve

You can print all codes from
PO-011 thru PO804 on www.engine-
light-help.com/generic

Remember every vehicle has MFG
Specific Codes that aren't easy to find
and you will need them also

Feb 04, 2011 | 1997 Ford Taurus

5 Answers

ENGINE RUNS FINE. SERVICE LIGHT IS ON AND THE CODE NUMBER SHOWING IS PO401. WHAT IS THIS FOR SAYING?


  1. po401 refers to an insuffient flow of EGR gasses
  2. locate egr valve
  3. with engine running at idle
  4. on the underside of the valve you can access the diaphram.
  5. wearing glove if ness
  6. lift diaphram while idling
  7. does engine stall or run very rough?
  8. if not remove valve
  9. start engine
  10. you should hear a very large vaccum leak and exhaust noise
  11. if either are missing investigate cause
  12. if ok reassemble.
  13. locate DPFE sensor
  14. inspect sensor for damage
  15. inspect hose to sensor for damage
  16. replace sensor
  17. 9ecffd7.gif

Aug 10, 2010 | 1999 Ford Taurus

1 Answer

Engine light on code reads po401


I believe this code is insufficient EGR flow. On this engine, the passages to the EGR valve often become carboned up and cause this code. Remove the EGR valve and inspect the passages to see if they need to be cleaned.

Jun 14, 2010 | 2006 Ford Mustang

1 Answer

Code po401 for check engine light


PO401 Insufficient EGR Flow, valve could be stuck or disconected.

It could very possibly the EGR tubes are clogged or the EGR is not opening or could be DPFE; first i would check the tubes on the DPFE and also clean the EGR tubes and egr it self simple brake clean and a hanger can clean the tubes and spray some in the EGR it also can get gunked up and not move properly.

Hope this help to solve it (remember comment and rated this).

Apr 05, 2010 | 1999 Mercury Sable

1 Answer

I have a ford explorer sport 2002 and my chek engine light came on it put out a code PO401 do you know what i need to buy


PO401 code means that:
The PCM has determined that there is insufficient flow in the exhaust gas recirculation system. Definition: EGR system fault (Exhaust Gas Recirculation) Probable Causes: a. Blocked passage on EGR system b. Failed EGR Valve c. EGR solenoid faulty d. Failed EGR pressure sensor where applicable e. Failed EGR position sensor where applicable

Mar 08, 2010 | 2002 Ford Explorer

1 Answer

Engine code comes up PO401 which states:EGR flow insufficient. What does this mean and how do I fix it?


It means the egr valve is sticking pull it off and clean the pintal valve. Or replace it.

Nov 20, 2009 | 1999 Ford Taurus

2 Answers

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

May 31, 2008 | 2002 Ford Explorer

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