Question about 2000 Isuzu Trooper

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2000 trooper code p0401 and p0440 both show up any suggestions???

When doing an obd2 test. both p0401 and p0440 codes show up.

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redbeard00
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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

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1 Answer

What are codes p0401 and p0300 mean on a 2000 isuzu trooper


P0401 is EGR problem
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Code p0440 shows up on a 2003 grand am. Car does not crank up.


this is an obd2 trouble code table, it can help you understand the meaning of code.
for p0440, you can try this:

Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.

i know this tool can clear your car code.

Inspect the EVAP system for cuts/holes in tubes/hoses

Inspect for damaged or disconnected hoses around the Evap purge solenoid

Check and/or replace the sensor

Check and/or replace the purge valve

Have a professional use a smoke machine to detect leaks

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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

Need to run fail codes for f150 2000 and how to short the computer to run test


Buy a cheap OBD2 tester (about $35) and plug it in to your vehicle to show trouble codes and sensor values.
Codes can then be cleared from computer to turn off check engine light.
The OBD2 plug has to be with in 3 feet of steering column on all OBD2 equipped vehicles.

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