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Diagnosis code service engine light code #p0401 what does this indicate

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  • aphelps Feb 02, 2009

    MY SERVICE ENGINE LIGHT HAS BEEN ON FOR 1 1/2 YRS. I NOTICED IT AFTER WHAT I BELEIVE IS THE LOCKING MODULE? IN THE REAR

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P0401 = EGR System - Insufficient flow


Echoing, hope this helps,

Mike

Posted on Jul 15, 2008

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How to fix P0302 and P0401 error codes for Lincoln Town Car 2001?


code p 0302 i cylinder 2 --misfire detected ===causes --- engine mechanical fault ( valve seat insert loose , burnt valve , cam followers/ hydraulic followers faulty)---wiring---ignition/fuel system---injector--ECT/MAF sensor ---ECM
possible injector fault ( blocked tip)
code p 0401 refers to exhaust gas recirculation (EGR) system--insufficient floe detected ==== causes --hose leak/ blockage ---basic setting not carried out (if required)---wiring---EGR valve ---EGR solenoid ---ECM
as you admit to knowing little about cars , take it to an accredited service center that works on your make of vehicle and get a proper diagnosis and quote
Use the codes information and causes I have given you when discussing the problem

Jul 22, 2016 | 2001 Lincoln Town Car

1 Answer

What are codes p0401 and p0300 mean on a 2000 isuzu trooper


P0401 is EGR problem
P0300 is a cylinder 3 misfire.
Replace EGR valve and do a full tune-up.

Mar 19, 2014 | 2000 Isuzu Trooper

2 Answers

2002 Mitsubishi Eclipse Service Engine Soon Light On


codes p0402--p0403deal with exhaust gas recirculation control circuit malfunction as well as the performance of this circuit check connections

Aug 29, 2012 | 2002 Mitsubishi Eclipse

1 Answer

Service engine soon light came on about two weeks ago... code P0401. Changed gas cap, egr valve and dpfe sensor. Also took throttle body off and cleaned with carb cleaner. Erased code aswell, light came...


P0401....Exhaust Gas Recirculation Flow Insufficient Detected

best advice with the EGR valve problem is to make a gasket with a coca cola can and sel it off completely

May 04, 2011 | Ford F-150 Cars & Trucks

1 Answer

Check engine light came on 1996 acura slx code reads p0401


Code P0401 indicates insufficient EGR flow. It's quite common on this model. The solution involves removing the upper intake manifold and cleaning the EGR passage.

Apr 16, 2011 | Acura SLX Cars & Trucks

1 Answer

FAILED EMISSIONS TEST P0401&P0420 CHECK ENGINE LIGHT RESETED MANY TIMES WHEN CUT OFF ENGINE LIGHT COMES BACK ON AFTER 5-6 MILES. I HAVE REPLACED EGR VALVE .STILL WA\ONT PASS INSPECTION. WHATS NEXT?


P0401 indicates that the Exhaust Gas Recirculation Flow Insufficient Detected. This can be because EGR is faulty . As you have replaced this then the problem must be with the vacuum line . EGR valve vacuum line which can be broken or blocked. The vacumn ine must bbe checked for leaks or any blocks using an vacumn pump connected the line.

P0420 indicates that the down stream oxygen sensor reading is not steady and it is connected with the code P0401.

Jan 05, 2011 | 2001 Toyota Camry

1 Answer

Check engine light comes on


A malfunction indicator lamp (MIL), commonly referred to as the "Check Engine Light" is an indicator of malfunction of the computerized engine management system. It is found on the instrument console of most automobiles. When illuminated, it is typically either an amber or red color. On vehicles equipped with OBD-II, the light has two stages: steady (indicating a minor fault such as a loose gas cap or failing oxygen sensor) and flashing (indicating a severe fault, that will eventually destroy the catalytic converter, such as a misfire). When the MIL is lit, the engine control unit stores a fault code related to the malfunction, which can be retrieved with a scan tool and used for further diagnosis. The malfunction indicator lamp is usually labeled with the text check engine, service engine soon, check engine soon, or a picture of an engine.
The MIL appeared in the early 80s along with computerized engine controls. Even the earliest systems, such as GM's CCC (Computer Command Carburetor) system had self diagnosis functionality. When the computer detected a fault, it illuminated the MIL. Up until OBDII, on most cars the MIL could output codes, when two pins on the ALDL are jumped, the light would flash the codes, for instance (blink) (pause) (blink) (blink) for code 12. Some manufacturers retained this feature even after OBDII, such as Honda.

Hope this help (remember comment and rated this). Good luck.

May 09, 2010 | 1995 Toyota Camry

2 Answers

Mercury sable 2001 duratec engine DOHC I get check engine light and diagnostic code PO401". Any suggestions?


Barring any vacuum leaks, P0401 is indicative of a bad EGR valve. Hope this answers your question. Best of luck.
Greg

May 30, 2009 | 2001 Mercury Sable

1 Answer

P0401. P0133, P1131- emmision test


Based on what the tech manuals say I would change the DPFE sensor for the EGR Valve, careful not to tear the special silicone rubber hoses that go to it from the exhaust, as a Ford dealer tech I saw these codes allot, and the DPFE sensor was almost always the issue or the hoses going to it.

Oct 16, 2008 | 1996 Ford Taurus

1 Answer

Diagnosis scan code p0401 what does this indicate


P0401 = EGR System - Insufficient flow

Mike

Jul 14, 2008 | Saturn SL1 Cars & Trucks

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