Question about 1996 Toyota Tercel

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P0401 code code is coming up p0401 have checked the egr valve its operating normally have cleaned the valve, hoses and metal pipe. what else could it be?

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  • Anonymous Mar 14, 2014

    EGR VALVE TESTS OUT FINE BUT STILL GOT FAULT CODE AND STILL RUNNING IN LIMP MODE

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P0401 indicates that EGR Flow Insufficient.

But if you have handled it and believe it is okay, I will give you tips on turning the warning off.

  • All trouble codes must be purged from the ECUs memory after repairing the faults. Otherwise, code(s) would remain in the ECUs memory indefinitely and would appear along with a new code in the event of a future problem.
  • Remove the EFI fuse (15A) for 30 seconds with the ignition switch OFF to clear any codes. It may take longer than 30 seconds, depending on ambient temperature (the lower the temperature, the longer the fuse must be left out).
  • Trouble codes can also be cleared by disconnecting the vehicle battery. However, other memory functions (clock, radio, etc.), will need to be reset.
  • After the codes are cleared, road test the vehicle (as applicable for the fault) and recheck if any codes reset. If so, it indicates that the trouble area has not been repaired correctly.
Or remove the battery terminal head for 10 minutes.

Posted on May 27, 2009

  • Onifade Adewunmi
    Onifade Adewunmi May 27, 2009

    Rate fixya dear cos it does it.

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1 Answer

I have a Ford F-150 xlt 4.6 with a p0401 code.


code p 0401 refers to exhaust gas recirculation (EGR) system---insufficient flow detected==== causes ---hose leak/blockage, basic setting not carried our (if applicable)---wiring---EGR valve ---EGR solenoid ---ECM
when you have done everything make sure that you use a scan tool to reset the ECM
Items that you haven't mentioned are wiring and substituting the ecm with a known operational one
bad wiring and connections / ground , broken in side the insulation may cause the problem as well

Sep 25, 2016 | Ford F-150 Cars & Trucks

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03 honda civic 1.7L p0401 EGR code.


In 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)

Read more at: https://www.obd-codes.com/p0401
Copyright OBD-Codes.com

Sep 19, 2016 | 2003 Honda Civic

2 Answers

How do I correct a P0401 code on my 2.2 chevy corsica


The passages are plugged ! pull EGR valve an inspect passages and the pipe for a restriction or damage and repair as necessary.

May 30, 2015 | Chevrolet Corsica Cars & Trucks

1 Answer

1996 Trooper (P0401 Code- GONE!!!-) BUT,,,,now I have Code- P1133 and P1153. Both are O2 sensor codes. Here is the weird thing! I tried everything in the book to try and fix the P-0401- Insufficient...


I had a similar problem with code PO401
The solution was to loosen up the throttle cable a bit.
Since the TPS value has to be at 0.0% at idle.

May 03, 2011 | 1996 Isuzu Trooper

1 Answer

I have a 2004 lincon ls v6 and I got the code p0401 I replaced the egr valve completely and the code still came back on, what do I do? Please help.... clueless.


P0401 is a low egr flow code. It is rarely the EGR valve and more often than not the DPFE sensor that has failed. To find the DPFE sensor follow the metal tube from the EGR valve to the exhaust pipe. There will be two rubber hoses attached to that tube. The DPFE sensor will be on the other end of those hoses.

Make sure there are no holes in the rubber hoses. This can cause false codes as well.

Nov 07, 2010 | 2004 Mazda 6

1 Answer

I have the engine check light on my 2001 Hyundai XG 300. The codes I brought up with the OBD2 reader were P0100 P0115 P0120 P1600 What would you suggest is the problem and fix on this I also...


Welcome to FIxYa.com
Description of codes are:
P01600 - Serial cable malfunction-- check connection,
Po115-Coolant sensor-indicates a open or short-circuit in the engine coolant temperature sensor circuit.

The P0401 code is Insufficient Flow Exhaust Gas Recirculation System.

The code is set when the engien computer detects less than the requested amount of EGR flow when the engine is hot and is under load.

What usually sets the code is an inoperative EGR valve, or a carbon clogged port under the EGR valve.

On your engine, the EGR valve is vacuum operated, and there is a little computer-controlled EGR solenodi valve in the vacuum hose that detemines how much vacuum the EGR valve gets. If this solenoid is bad, or there is a vacuum leak in one of the hoses, the EGR valve won't open when it should setting the code.

Since the dealer already cleaned the EGR valve tube, I would suspect your problem is likely due to a bad EGR solenoid valve or a leaky vacuum hose to the EGR valve.


Here is the EGR solenoid valve part number and list price:

P/N 3946038750 $40.59



I would clear the codes first and run engine for two min and re-check codes.



Write to me of the findings and we will go from there.





Regards, Lee Davidian


A Four Thumbs up ^^^^ is appreciated for answering your question.

Thank you, Lee Davidian

Oct 19, 2010 | 2001 Hyundai XG300

1 Answer

I use seafoam though vaccume hose after that i read code p0401 what that means


P0401: Exhaust gas recirculation (EGR) system - insufficient flow detected


Causes: Hose leak/blockage, basic setting not carried out (if applicable), wiring, EGR valve, EGR solenoid, ECM

better clean out hoses and valves...

Oct 04, 2010 | 2002 Honda Accord

2 Answers

P0401 Exhaust Gas Recirculation Flow Insufficient Detected replaced the EGR valve but "check engine light" comes back on with same P0401 code


check the metal line that comes off the exhaust and make sure it isnt plugged with carbon. also remove the egr and check the port and see it's clogged as well

Nov 17, 2009 | 1998 Oldsmobile Silhouette

3 Answers

Code on diagnostics p0401


Code on diagnostics p0401:

What is going on?
Exhaust Gas recirculation low flow detected means that: there is vacuum problem in the EGR system - between the combustion chamber, EGR valve (mechanical - blown up diaphragm or clogged airlets/hoses) , EGR Modulator Valve (mechanical - blown up diaphragm, dirty EG/air filter or clogged airlets/hoses) and Vacuum Switching Valve ((mechanical - blown up diaphragm or clogged airlets/hoses OR electrical - VSV not properly synchronizing with the ECM, for instance).

Effects?
This causes the combustion chamber temperature to increase and produce Oxides of Nitrate (NOx) that is out of an acceptable emission range. This triggers the Malfunction Light (check engine light) to stay on (after a couple of driving cycles)!
Solution: Focus on EGR airways (hoses...) and organs (EGR valve, EGR Modulator, VSV), clean, check or replace the defected one. VSV seems to be criticale as it plays electrical & mechanical function. Once the repair is done, Clear the P0401 code using an OBII scanner.

Dec 21, 2008 | 1996 Lexus LX 450

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