Question about 2001 Honda Odyssey

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EGR truble code

I changed EGR valve twice and the engine light still comes on.When scanned the reading you get is insufficent air flow.I tried changing air filter and flushing air intake system but it still didn't help.Do you have any suggestion for me that might help to fix this?

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Did you reset the computer after changing the egr? do this by removing the positive battery cable for 10 mins.

If this doe snot work, replace the mass air flow sensor, that is the unit the air filter tube connects to, it has a wire going to it.

Posted on Nov 26, 2008


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1 Answer

I have a 1998 ford escort with a check engine light on and can't get it off

Here is a list of possible causes. Some things you have already done.

EGR solenoid valve harness is open or shorted
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Oct 07, 2012 | 1998 Ford Escort

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I have a code po401

The P0401 is an insufficient flow code and is almost always caused by the DPFE sensor. This sensor measures the back pressure in the exhaust as is a more accurate way of determining EGR flow than the old EGR position sensors. When the EGR valve opens the exhaust back pressure changes and the DPFE sensor informs the processor of this information. If the sensor isn't reading a change when the EGR valve is turned on through the solenoid, it will throuw a p0401 code. The only true way to check this is to install a scan tool and measure the DPFE voltage. Normal DPFE voltage is approx. .9 volts at idle.
The DPFE sensor dealer part price is approx. $140 but you will find cheaper prices at an aftermarket parts store. Good luck.

Apr 04, 2011 | 2006 Ford Fusion

1 Answer

I replaced egr valve code 401 still comes up on my scanner. why?

The code P0401 is often not a problem with the EGR valve itself. Rather, the EGR system is not allowing enough EGR to flow back into the combustion process to sufficiently cool the peak firing temperatures. Once the code P401 has been retrieved with a scan tool, the freeze frame data should be documented and analyzed in order to determine what engine conditions were present when the code was triggered. It is recommended that the vehicle be driven in such a way as to duplicate the code setting conditions with a data streaming scan tool connected, so the behavior of the EGR actuating components and feedback sensors can be monitored.
Common Tests to Determine Whether the Problem Is an EGR Control Problem, a Plugged or Restricted System, or a Defective Feedback Device
  • Does the engine die, not just stumble, when the EGR valve is manually raised to its maximum?
    (Use either a vacuum pump or bi-directional scan tool if it's a digital EGR valve.)
  • Is the EGR valve getting sufficient vacuum? (Use the manufacturer EGR vacuum spec.)
  • Is the EGR system restricted? (The engine stumbles, but does not die.)
  • Is the EGR system plugged? (Engine RPM does not change.)
  • Does the EGR valve work?
  • Raise the RPM to 3000 and check manifold vacuum. Then open the EGR valve to its maximum-the manifold vacuum should drop by at least 3" of mercury. If it does not, there is a flow and/or restriction problem.
  • Test the EGR temperature sensor (if equipped) with a propane torch and a DVOM.
  • Test the accuracy of the EGR valve position sensor with a scan tool or DVOM by raising or lowering the EGR valve.
  • Test the Digital EGR Pressure Feedback Sensor (DPFE) with a data streaming scan tool to verify that the voltage or lift percentage changes according to spec.
  • Verify that the front Oxygen Sensor readings drop and the Short Term Fuel Trim increases when the EGR valve opens. (EGR leans out the mixture.)

Mar 29, 2011 | 2000 Pontiac Grand Am GT

1 Answer

Insufficient air flow The EGR valve has been changed twice, but the engine light (401 code, EGR) stills come on what else could this be?

there's a solenoid under the intake manifold which has vacuum hose connects to egr valve. this solenoid is having a lot of problem.

May 27, 2010 | 1997 Toyota Camry

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I recently change the egr valve on my car due to P0401

Could be clogged egr passages in the intake. Also could be just do to a reflash needed of the computer. GM has come up with new software for the computer to fix this problem.

May 19, 2010 | 2000 Chevrolet Monte Carlo

1 Answer

I recently change the egr valve on my car due to engine light, but I had the light reset and the engine light came back on. I put it back on the machine and got a reading of po401 which is egr flow...

ok here the problem! you replaced the egr for no reason !the problem is all the carbon build up in the intake manifold just under the egr valve! this happens the alot of gm s !to solve the problem intake must b removed and clean out !!! remove all the carbon from the egr port!

Mar 19, 2010 | 2000 Chevrolet Monte Carlo

1 Answer

Egr flow insufficant 1999 camry already replaced egr system

The engine check light still on after you replaced the EGR valve right?
This time try replace the VSV , hope this can help. Good luck.

Mar 12, 2010 | 1999 Toyota Camry

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Code P0401 EGR Insufficient Air flow detected - 2000 Toyota camry

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Jul 29, 2009 | 1996 Toyota Camry

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The EGR valve isn't getting the vaccum required to operate the valve. Check engine light is on. replaced the valve in check engine light still come on insuff. air flow

what dtc do you have? is it p1401? if so the description is for insufficent air flow egr circuit. this is typicaly caused by a faulty DPFE sensor (delta pressure feedback emission) it is about the size of a buisness card and about 1/2" thick. its black and has a small wiring connector and 2 thick vaccum hoses hoing to it. Fords first step for repair for this DTC is to replace dpfe sensor and to assure hoses are not ruptured. i STRONGLY SUGGEST to use only factory sensors as it is often i replace new aftermarket ones that done work right from the start. this part is relatively inexpensive....good luck!

Jun 10, 2009 | 2002 Ford Explorer

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Engine service light / 4 codes read description below

P1744 is probably the TC going on the way out. :(

P 340 is probably the sensor itself. Don't get the Dorman one if it is the OHV motor.

P 401 is probably a bad DPF EGR sensor.

Jun 16, 2008 | 1997 Ford Taurus

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