Question about 2001 Acura 3.2TL

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Code P0401 (Exhaust Gas Recirculation flow Insufficient Detected); What repair will be required?

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Easy fix, remove plastic engine cover 4 bolts. Remove intake cover, its directly under the plastic cover in the center, 8 bolts I believe. The intake cover has passages that will be clogged as well as mating surface of intake. Scrape and vac out. clean with carb or brake cleaner,reassemble, good to go.

Posted on Jan 28, 2013

  • david james Mar 06, 2015

    Be sure gasket port holes are lined up with intake port holes. There has been reports of the gasket being installed incorrectly by honda/acura.

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Usual cause is a leaking line to or from the evap canister,but the code can also set if the fuel cap is not tight enough,these systems are fussy so start there.The best way to find a leaky line is to find a shop with a "smoker"or"fogger",this will put a clear visual cause of the leak that is visually usable by the technician and then easily fixed,usually cheaper then unneeded replacement of parts.Hope this helps.

Posted on Aug 25, 2010

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You will need to replace the egr valve as well as its controller,
unless it is a combo unit with a solenoid built in .

Posted on Aug 25, 2010

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1 Answer

What do OBDII Codes P0401 and P0404 indicate in a 2001 Chevy Impala?


P0401 usually means for most vehicles
Exhaust Gas Recirculation Flow Insufficient Detected

P0404 usually means for most vehicles
Exhaust Gas Recirculation Circuit Range/Performance


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What do the OBDII trouble codes P0401 & P0404 mean with 2001 Chevy Impala?


P0401 Exhaust Gas Recirculation Flow Insufficient Detected

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Trouble code P0401


code p0401 refers to exhaust gas recirculation(EGR) system-insufficient flow detected--- Causes ---hose leak/blockage, basic setting not carried out( if applicable)wiring--EGR valve/solenoid---ECM I would check the EGR valve solenoid first. Replace the faulty units with genuine one because most aftermarket units are not set for OEM cpu units and are not completely
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Trouble code P0401


P0401 Exhaust Gas Recirculation Flow Insufficient Detected
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Check engine light code P0401 98 Ford expedition


OBD-II Trouble Code P0401 - Insufficient EGR Flow

EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR. You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

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

Check it and keep us updated. Hope this helps (remember to rating this free answer).

Oct 13, 2011 | 1998 Ford Expedition

2 Answers

Fault code p0401


This error means Exhaust Gas Recirculation Flow Insufficient Detected.

You can deatils on the following site http://www.permoveo.ltd.uk/tabid/122/OBD-Error-Code/P0401/Diagnostics/Hyundai/Default.aspx

but for convenience I have reproduced that information here:
.
Generic OBD Error Code Details for P0401 Exhaust Gas Recirculation Flow Insufficient Detected What does this mean? OBD Code P0401refers to
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR. SymptomsPossible sumptoms of OBD code P0401
You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms. CausesPossible causes of OBD code P0401
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's & 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 Related CodesP0400 P0402 P0403

Jul 12, 2011 | Hyundai Tucson Cars & Trucks

2 Answers

I have a code P0401. What is this and how can I fix it?


P0401 - Exhaust Gas Recirculation Flow Insufficient Detected

Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR passage clogged
- Exhaust gas leaks Possible solution - Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve

Mar 20, 2011 | 1998 Ford Taurus

1 Answer

I have 4 codes: 1- p0401 2- p0401 Pd 3- p0403 4- p0405 what do I have to do to get rid of these codes. what are these and where are they located on a 2004 grand am Thx


p0401
Exhaust gas recirculation-insufficient flow detected
p0403
Exhaust gas recirculation-circuit malfunction
p0405
Exhaust gas recirculation vave position sensor A- circuit low

hope this helps. not sure where they are located

Aug 27, 2010 | 2004 Pontiac Grand Am

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