Question about 1999 Chevrolet Venture

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Have 99 ventura reading code p0401,vent to intake was stopped up cleaned out still getting reading

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  • Chevrolet Master
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You will have to replace the egr position sensor to get this code to stop reading.

Posted on Oct 06, 2009

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Fault code p0401


Most probably the EGR (Exhaust Gas Recirculation system) is full of gunk, generated by the exhaust gas and breeder fumes and needs to be cleaned. Though it might be some other system that triggers this error. You could do the following to see if it can be remedied.
  • Check/Clean Exhaust Gas Recirculation (EGR) System
  • Check/Replace Exhaust Gas Recirculation (EGR) Valve
  • Check Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve
It is likely this cannot be fixed easily and needs a full diagnostics and system cleanup at the Dealer/Skoda authorized service center. Might cost a lot since you probably need to remove the intake manifold, etc. to get the system cleaned properly.
You can read more about the code and the issue at ross-tech:
16785 P0401 001025

Feb 14, 2015 | 2006 Skoda Octavia 1.9

1 Answer

Ford e150 codes: p0401, p1401 and p0174. read the more details to see what the symptoms are.


Stop, DO NOT replace expensive parts or O2 sensor! Ford Explorer codes p0174 , p0401 , rough idle and check engine light on. First thoroughly check all of the hoses and elbows connected to the intake and EGR (vacuum system) for splits, cracks, holes or tears, this could quickly cause these codes and fixes for less than $10. Check all connectors and the EGR valve sensor it could have a crack as well, inspect thoroughly because a split sensor could appear attached to the vacuum hoses but hoses could just be sitting there not actually attached due to a split or crack. This was my problem replaced the EGR valve sensor and the two little vacuum hoses attached to them for $50-60 with in stock parts at the local parts store. Took less than 10 minutes to replace and is easily accessible, the check engine light turned off immediately without having to reset the codes by disconnecting the battery, idle became normal and fuel efficiency better. If you have THOROUGHLY inspected every hose, connector and elbow and found no issues, clean the MAF with electrical contact cleaner ( let dry) and clean the EGR with carbon cleaner. A dirty MAF or EGR could also cause these codes to pop up. If this still doesn't work, then consider replacing the EGR, if that isn't it then try the O2 sensor. Good luck!

Jun 23, 2012 | 2002 Ford E-Series

1 Answer

2002 Isuzu axiom P0401 and p1312 codes driving me nuts. Plz help


google how to adjust the cam timing on this particular car, is it controlled by a sensor?

Jan 31, 2012 | 2002 Isuzu Axiom

2 Answers

#$%@&# P0401 code problem- 3.2 SOHC Trooper. "Insufficient airflow"- I have done it all from replacing the EGR valve to cleaning the pipe, hoses, throttle body, channel from the EGR valve...


Unfortunately, most of the conditions that can initiate the P401 fault code require that signals be read off an analyzer.
Potential issues include a faulty MAP sensor, a blockage in the exhaust system (possibly the catalytic convertor), excessive deposits on the EGR valve, or the EGR valve itself is defective.

And yes, a faulty connection at the harness can activate those DTC numbers. P1406 usually indicates a fault with the PCM.

You might want to have it analyzed and let them tell you what part is defective then change it yourself.

Apr 21, 2011 | 1996 Isuzu Trooper

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

2 Answers

My 2003 chevy impal idles very high an i found 3 codes that are p0113,p0401,p1639,can anyone help me understand whats going on


p1639 is low a/c refrig. so that's not it. p0113 is low intake air temp. which is telling the computer its -38 f. This can cause the idle to be raised. and p0401 is EGR flow test failed.
Can you post what motor this has 3.8 liter or the 3.4 liter. This is something that we need to know.

Feb 14, 2011 | Chevrolet Impala Cars & Trucks

2 Answers

How do I clean the EGR PIPE in this 1996 Trooper? I have a P0401 code, have replaced the EGR valve, put a cleaner thru the system via the air intake, put a cleaner in the gas and still the P0401 code. I...


It should just unbolt. The problem is those tend to get frozen to the exhaust manifold, especially the higher mileage ones. Once you get it of, let it set in carb cleaner for awhile. If you have a flexable wire gun stock type brush, this will help aid you in this. You might even try a local machine shop for the carb solvent if you do not have any.

Feb 10, 2011 | 1996 Isuzu Trooper

2 Answers

I have a 98 Expedition and the check engine light keeps coming on. I pulled the code (P0401. I changed 3 parts DPFE,EGR valve and the Idle air control valve and it still come on. Any suggestions?


I have several ideas. The code 401 is about EGR flow. While it can be an Electric switch like the DPFE that you replaced, the diagnostics do not included the source of the EGR flow or the Backpressure pipe which the vacuum lines from the DPFE operate from.

In short, it is about plain old low tech plumbing. The EGR passage gets its flow from a groove under the Airhorn. If the groove is plugged you need to remove the Airhorn and its gasket and scrape the groove clean. It has about 8 bolts, a $10 gasket and you need to disconnect the Air Intake and a few Electric wires.

Connected to the DPFE are 2 high temperature Vacuum lines. If the tip above does not help, then you need to check this plumbing pipe out for holes. In particular, there is a irregular joint on this pipe which can separate and vent. It should not vent. This will throw off the closed system and generate Error Codes. One end goes towards the exhaust and the other to the EGR.

Finally, do not forget to clear the computer. Old problems stay in the system for 25-35 Startups. I hope my solution has been very helpful to you.

Jan 05, 2011 | 1998 Ford Expedition

2 Answers

I got 99 honda odyssey and p0401 code I clean the EGR but estl the problem


did you clean the valve or the ports. this code is for the ports clogging up. you need to remove the top of the intake off or plenum and you will see where the passage from the egr comes over. clean the plenum out where the carbon build up is and make sure air flows throughout. also blow air between the intake and the egr valve(remove the valve) and make sure there are no restrictions in that passage either. reassemble and you should be fine.

Dec 20, 2009 | 2002 Mazda Tribute

1 Answer

I have a 99 monte carlo with a 3.1, the check engine light came after I had changed the wires and plugs about a month ago, the code came back as p0401 egr insufficient air flow,I bought a new egr, gaskets,...


Remove the air tube to the throttle body. Open the throttle all the way and look inside with a flash light. You are looking for a lump of carbon at the egr port int the intake manifold.

Remove the egr valve, using a hanger or stiff wire, clean out the egr port removing the carbon from the intake manifold.

Sep 06, 2009 | 1999 Chevrolet Monte Carlo

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