Question about 1996 Isuzu Trooper

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P 0401 code "Insufficient Airflow" STILL!! 1996

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  • Isuzu Master
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The exhaust path there must be clear
end to end, its NOT air that is EGR fail for exh. flow, for EGR only.
which engine, ?????
no 2 engines made use the same flow.
so..........????????

Posted on Mar 20, 2017

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6 Suggested Answers

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Posted on Jan 02, 2017

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daves944
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SOURCE: 1998 Isuzu Trooper 3.5 4wd Emission p401 insuf flow. BAD Fuel ec

There is a system that monitors how well your egr system is working and it is saying that it is not. The egr valve is just one small part of that system. The plumbing could be plugged or the monitoring sensor, if it has one could be bad. I'll check into this a little further and get back.

http://www.obd-codes.com/p0401

Posted on Mar 19, 2009

  • 286 Answers

SOURCE: Peugeot 407SW Estate: airflow impeded-feels as if

Not familiar with vehicle but "rule of thumb". It's usually located under the wiper panel (high up )in the engine compartment and close to the heater motor assy itself . The replacement filter will give you some notion of size and location . Good Luck

Posted on Apr 11, 2010

redbeard00
  • 957 Answers

SOURCE: 2000 isuzu trooper: OBD-II Trouble Code: P0401 Insufficient EGR F

Your SUV is really giving you a hard time, lol. Sorry but I've had those days too.
I would try to check if you have blocked EGR passages. If ok check for restricted MAP sensor vacuum hose/passage or restricted exhaust. I know you replaced the CAT but if the muffler is blocked then there would still be a restriction. Also check the wiring and connection to the MAP sensor.

Posted on Apr 28, 2010

  • 17 Answers

SOURCE: How do I clean the EGR PIPE in this 1996 Trooper?

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.

Posted on Feb 10, 2011

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SOURCE: #$%@&# P0401 code problem- 3.2 SOHC Trooper.

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.

Posted on Apr 22, 2011

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1 Answer

How to fix P0302 and P0401 error codes for Lincoln Town Car 2001?


code p 0302 i cylinder 2 --misfire detected ===causes --- engine mechanical fault ( valve seat insert loose , burnt valve , cam followers/ hydraulic followers faulty)---wiring---ignition/fuel system---injector--ECT/MAF sensor ---ECM
possible injector fault ( blocked tip)
code p 0401 refers to exhaust gas recirculation (EGR) system--insufficient floe detected ==== causes --hose leak/ blockage ---basic setting not carried out (if required)---wiring---EGR valve ---EGR solenoid ---ECM
as you admit to knowing little about cars , take it to an accredited service center that works on your make of vehicle and get a proper diagnosis and quote
Use the codes information and causes I have given you when discussing the problem

Jul 22, 2016 | 2001 Lincoln Town Car

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1996 toyota corolla p0401


code p 0401 refers to 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
take it to an accredited service centre that has experience on your make of vehicle , tell them the fault details and get a proper diagnosis to determine the fault and a quote

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99 acura code p1491


Code P1491 in Honda/Acura vehicles means insufficient EGR valve lift. Note - this is not the same as 0401 for EGR low flow when you have to clean EGR passage in the intake manifold. If code 1491 is not accompanied with 0401 - that could be faulty EGR valve itself. Try to reset the code, and if it will return soon - replace EGR valve. If, however you see both codes together - cleane the manifold passage before you replacing the valve.

Sep 20, 2012 | Acura RL Cars & Trucks

1 Answer

I have 1996 Izuzu Trooper. The "Check Engine" light is "ON". What are the problems with the engine? Please advise!


The PCM has the answer to that. It is just telling you there is an issue with one or more of the systems it controls. What you have to do is get any codes that are stores to know what the problem is.

Autozones, or maybe other stores, will hook up a code reader and check to see what codes the PCM is telling you.

Or if you're a weekend warrior that works on your own stuff then invest in at least a code reader. Actron is pretty good and start around $75. I have seen code readers/mini scanner (they show live date from the sensors and such) at Harbor Freight for around $60.
Plus some people like to buy tools and its a good excuse to do that!

Sep 14, 2011 | 1996 Isuzu Trooper

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

2000 isuzu trooper: OBD-II Trouble Code: P0401 Insufficient EGR F


Your SUV is really giving you a hard time, lol. Sorry but I've had those days too.
I would try to check if you have blocked EGR passages. If ok check for restricted MAP sensor vacuum hose/passage or restricted exhaust. I know you replaced the CAT but if the muffler is blocked then there would still be a restriction. Also check the wiring and connection to the MAP sensor.

Apr 28, 2010 | 2000 Isuzu Trooper

1 Answer

Ignition Key Stuck


We had the same problem, with the same diagnosis. It turned out to be that the shifter was not fully forward in the park position!

The mechanics we called said it was the Shifter Interlock Solenoid as well (but an honest mech. actually solved the prob. - by pushing the shifter all the way forward - and didn't charge a dime).

CP

Aug 11, 2008 | 1996 Isuzu Trooper

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