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Anonymous Posted on Feb 25, 2015
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Egr flow insufficient - Cars & Trucks

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Brian Marlowe

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  • Posted on Dec 12, 2023
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Have a 2002 suzuki vitara 2.0 p4001 code insufficient egr flow but cant find blockage and have replaced egr and cleaned egr tube

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  • Posted on Feb 25, 2015
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Depends on the year,make,model and engine size to determine the reason for the insufficient EGR flow which sets a p0401 engine code. If it is a Ford vehicle the most common failure is a bad DPFE sensor. If it is a GM vehicle with an electronic EGR valve, the valve is usually bad. Most imports use a EGR temp sensor which ends up being a bad sensor or vacuum line to the valve. Send me more info and I will be glad to help you fix the problem.

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1helpful
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1996 Toyota Corolla. How do I fix code P0401?
Hi Joe

Like all solenoid valves, you can clean them with throttle body cleaner and then test the solenoid electronically with a 12 volt supply.

P0401 Exhaust EGR Flow Insufficient

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May 1, 2014 - The sensor is how the ECM determines there's insufficient EGR flow. It's on the intake-side of the system and if not enough exhaust-gases flow ...

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P0401 : EGR Flow Insufficient on 1996 Toyota Corolla

 OBD-Codes.com https://www.obd-codes.com > forums > viewtopic
Jan 20, 2007 - on EGR codes, we recommend replacing the EGR, vacuum modulator and VSV (if equipped) and cleaning out the carbon buildup to the intake from the ...
If that finds nothing wrong, remove the EGR valve and bypass tube and check them for cleanliness and blockages. If they are blocked, follow your maintenance manual's instructions for cleaning them out so you do not damage the valve, then replace them and reset the ECM.

Insufficient EGR Flow - P0401 Code - Toyota
Read full answer
Jan 12, 2024 • Toyota Cars & Trucks
0helpful
1answer

I have a 2000 Impala LS 3.8 with a recurring P0401 insufficient egr flow code.
If you have replaced the EGR valve multiple times and followed the GM trouble chart, but the P0401 insufficient EGR flow code continues to recur on your 2000 Impala LS 3.8, there are a few other things you can check:
  1. Check for clogged EGR passages: Make sure that the EGR passages in the intake manifold are not clogged with carbon buildup. Use a vacuum gauge to check for proper vacuum at the EGR valve to ensure the passages are clear.
  2. Check the EGR solenoid: Make sure that the EGR solenoid is functioning properly. You can use a multimeter to test the solenoid's resistance and check for proper voltage and ground signals.
  3. Check the vacuum supply: Make sure that there is adequate vacuum supply to the EGR valve. A vacuum leak or restriction in the vacuum line can cause insufficient EGR flow.
  4. Check the catalytic converter: A clogged or damaged catalytic converter can also cause insufficient EGR flow. You can test the converter's efficiency using a digital thermometer.
  5. Check the wiring and connectors: Make sure that all wiring and connectors related to the EGR system are in good condition and properly connected.
If none of these steps resolve the issue, it's possible that there is a problem with the PCM. You may need to have the PCM tested or replaced by a qualified mechanic.
Read full answer
Mar 03, 2023 • Cars & Trucks
0helpful
2answers

Fix 1999 Ford E150 van with code P0401
That's not what this code is about .P0401 - EGR Flow Insufficient Detected . Probably clogged egr passages .
P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
  • Vacuum supply
  • EGR valve stuck closed
  • EGR valve leaks vacuum
  • EGR flow path restricted
  • EGRVR circuit shorted to PWR
  • VREF open to D.P.F. EGR sensor
  • D.P.F. EGR sensor downstream hose off or plugged
  • EGRVR circuit open to PCM
  • VPWR open to EGRVR solenoid
  • D.P.F. EGR sensor hoses both off
  • D.P.F. EGR sensor hoses reversed
  • Damaged EGR orifice tube
  • Damaged EGRVR solenoid
  • Damaged PCM
Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents.
Read full answer
Nov 05, 2018 • Ford Cars & Trucks
0helpful
1answer

How to fix insufficient airflow in egr on 2000 Ford F150 4.6 engine?
Ford P0401 DPFE EGR Pressure Sensor Diagnostics and Repair with Contest Check out other youtube videos as well
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May 03, 2016 • Ford Cars & Trucks
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Why is codes p2106 p0401 on?
P2106 THROTTLE ACTUATOR CONTROL SYSTEM,-PO401-EGR INSUFFICIENT FLOW
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May 29, 2014 • 2005 Ford Explorer
0helpful
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EGR FLOW INSUFFICIENT
On your EGR tube you have two hoses coming off of it. If you put them on in reverse you will get a code of insufficient flow. I put headers on and replaced EGR tube and valve and the flow sensor and that's the code that I received switched the hoses and solved the code
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Feb 26, 2013 • 2000 Ford Expedition
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Engine code p0401 in 2004 ford explorer 4.0 motor insuficient gas flow detected
p0401 is egr flow insufficiant. check or remove and clean egr and port. and also check the vacuum lines to egr. Insufficient EGR flow frequently is caused by clogged EGR passageways.
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Aug 19, 2010 • 2004 Ford Explorer
4helpful
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I have a OBD II Trouble Code PO401
PO-401
EGR Flow Insufficient Detected
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May 15, 2010 • 1999 Chevrolet Lumina
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Insufficient egr flow. Cooling fan does not run
Is your AC system charged and working? I believe the pcm will not activate the fan unless the AC system is operational.
Read full answer
Feb 22, 2010 • 1999 Saturn SL
0helpful
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Ford F250 egr insufficient flow
i found that the egr valves sometimes get clogged up with carbon and can be remedied by removing the valve and scraping the port clean .
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Dec 09, 2008 • 2002 Dodge Neon
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