Question about 2001 Isuzu Rodeo

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Codep0342-code p0402 - code p1404 - p0402 check engine lightis on but car is running fine

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  • Anonymous Mar 19, 2014

    Check engine light and p0402 and p1404 codes

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Could the egr driver in the pcm be bad? codes p0402 and p1404


no voltmeter, working blind.
my guess engine runs ok>? huh? 3.2 or 3.5L or?
and only 2 codes (DTC'S) right ?>
can it be,,, well it can be lots of things..

you never said what engine is there, must we guess that.
to fix any engine, we need to know, what it IS first
then remove wallet and see, ok i live canada or not.
as you may not know smog parts vary by COUNTRIES LAWS.
so ill pretend you said USA on this USA forum........ what else can i do?> but beg locations.........

first off the answer to your question is yes, and for all cars from 1988 to now...(ECU based EFI cars)
but why assume the worst case. why not do the tests.
why not read the manual on the car the FSM, (alldata.com)
see how it works
its and electric motor driven EGR, and with a feed back sensor.
i dont have the DTC list. in usa documents or hard to find on this mostly dead car maker here..... (find dealer and a book? good luck)

best i can tell is 402 is excessive. and that means
the feed back is stuck wide open. bad egr main. end story.

P1404 (that 1 means factory code only) custom.
and means opposite of 402.....

cleaning the exhaust path was best ploy.
now it can flow, so next is the valve must open and close
with PCM control
and last the read back sensors most work.
one way (sometimes works) is to leave the EGR connected
but removed from engine
key on 3 times
and see if the EGR does a reset cycle.
some cars the EGR will cycle 1 time, each key, on the smart hope that doing so, can unstick it and not allow engine to stall.
so look doing that.
if that works the readback sensor is bad. see below as ?
ive done may EGR system.s and helped trainees'

25520407-s4ytlrl2eq1g0qp4vyp302wy-3-0.jpg
let me do EGR rules.

1:exhaust path clear.
2: motor above on pin 1 and 3 works.
3: read back on pin 1 works.

keep in mind the EGR may work perfect and zero NOX pollution,

but if pin 1 lies (bad pot). telling PCM its bad and is NOT.
keep that in mind.
and pin 4 must be at 5v or the sensor will be dead.
I think this pin 5 is PWM modulated. at poin 3
and 12vdc at pin 5 for pwer.
pin 2 is ECU quite ground, 0v.

the car is old the EGR main is old
what is the chance the main this old is still good, not much in IMO.

Mar 05, 2015 | 1998 Isuzu Trooper

1 Answer

I have a 2002 saturn sl, codes p1404 & p0733 came up on reader. Now the car is making a noise that sounds like something is rubbing against rubber.


P1404 Exhaust Gas Recirculation System Valve 2 - Read Our Article on EGR Valve Codes For Help With This Saturn Check Engine Light Code

Cant find your P0733 code maybe incorrect.
See attached link for better information

May 23, 2014 | Cars & Trucks

1 Answer

What can i do if my car failed the emmissions test


P1404 is an EGR code for this application! (P1404 EGR Valve Closed Position Performance). You should clean the EGR valve and then there is a procedure to reset the learned voltage value, it may be alright but it has to relearn the voltage! To do this : The code sets if the PCM sees voltage that is more than 0.29 volts above the learned minimum. The engine needs to be RUNNING when the DTC is cleared. Clearing the DTC also triggers the closed EGR minimum voltage relearn. If you clear the DTC with the key on, engine off, the voltage may be high enough when the engine is running to trigger the code again.

Sep 28, 2012 | 2003 Kia Spectra

1 Answer

P1404 code


P1404 is EGR valve stuck open. Probably need to replace your electric EGR valve. First, I would remove it and clean the carbon out of it before replacing this expensive part.

Apr 05, 2012 | 2002 Hyundai Accent

1 Answer

My 2006 escape 3.0 idles rough but seems to run smooth down the road.engine light is on and shows code po402 excessive egr flow. engine starts fine when cold, but cranks for about 10 seconds unless you...


P0402 Exhaust Gas Recirculation Flow Excessive Detected A code P0402 most likely means one or more of the following has happened:
  • The DPFE (differential pressure) sensor is faulty and needs to be replaced
  • There is a blockage in the EGR (most likely carbon buildup)
  • The EGR valve is faulty
  • The EGR valve may not be opening due to a lack of vacuum
  • Solutions
  • With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor.
    • Check the voltage at the DPFE sensor both at idle and when the EGR is open
    • Replace the DPFE sensor

May 04, 2011 | Ford Escape Cars & Trucks

1 Answer

I am getting a light with code P1404 EGR on Ram


I would clean out the EGR valve and reset the fault code, if the valve is coked up it can stick and cause your problem

Jun 06, 2010 | 2006 Dodge Ram 1500

1 Answer

Chevy Impala 2001 w/ 3.8L engine - EGR stuck open


there are a couple of things, first make sure there are not restriction in the exhaust, i know the dealer has had to replace converters under warranty because of this problem, then theres a reflesh program for the computer due to this problem, and lastly,run with egr off make sure it clean of carbon,carbon gets stuck in pintle sets check eng lightbut carbon then blows by so when you remove egr you see nothing, well start with these good luck.

Nov 28, 2009 | 2000 Chevrolet Impala

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