Question about 2001 Oldsmobile Alero

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EGR Monitor will not set on code reader. Light was on for EVAP problem and has been wiped out. but EGR monitor will not set.

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Check you hoses for cracks.

Posted on Nov 22, 2013

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2001 kia optima new battery computer reset no check engine light but shows evap and computer monitor ing code


You must wait for the system to run internal tests then if it sees no issue it will clear and show ready. This is called an OBD2 drive cycle test. The EVAP system is slow to clear along with the EGR system.

Feb 16, 2015 | 2001 Kia Optima

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Hello again. I have the 2006 Nissan Altima 2.5S ......ok I had the issue bank 1 sensor 2 heater circuit low P0037 is the code I was getting. But when I connect the code reader it says that the heated 02...


O2 Emission Monitors & Evap Monitor-- are two
different systems

Get ALL your OBD Codes & work them one at a time,
& DO NOT Clear any data with code reader or removing
battery cable, or the monitors ALL have to run again

The heater may work in the sensor, but the sensor doesn't
switch fast enough or is worn out & the front sensors get
replaced at 100,000, before they fail or slow down

The Evap Codes will be needed, to work on that issue
That monitor runs last & only every few days

IF--- you had professional scan tool software, you would see
11 monitors & maybe 8 that run on your vehicle

There will be at least 2 for the O2,one for cylinder misfire,
one for evap, one for egr,& three others

Oct 21, 2014 | 2006 Nissan Altima 2.5

1 Answer

Evap code cleared not ready showing


The EVAP monitor is a pain to set. It needs 2 full drive cycles and will not reset sometimes if an EVAP code is pending. Check the pending codes with your code tool and see if there are any for the EVAP, if not, like I said, the EVAP is a tough monitor to set.



How many other monitors are not ready?

Apr 04, 2014 | 2001 Pontiac Grand Am SE

1 Answer

2002 evap code 403 won't go away. professors at a college confirm it is a driveability issue.


This code has nothing to do with the evaporative emissions system ! This is for the EGR valve.
P0403 Exhaust Gas Recirculation Circuit Malfunction ! You see the word CIRCUIT MALFUNCTION . electrical problem . Now what year, make , model an engine size,?

Jun 23, 2017 | Cars & Trucks

1 Answer

Need description of obd drive cycle


This is my drive cycle a generic drive cycle i have used many times over the years and it has never failed me most drive cycles are too specific and impossible to adhere to for most drivers follow these steps exactly 1. make sure all codes are cleared and no check engine light is on 2 make sure the fuel level is between 1/4 and 3/4 full (this is part of the enable criteria for the evap monitor to run ) 3 let vehicle set overnight 4 start engine and let idle until the temp gauge is in the middle (this cold start enables the evap monitor and runs the O2 sensor heater test )5 drive vehicle around town avoid the highway stay at below 50 mph and when stoping at lights remove your foot from the gas and coast from around 50 to about 10mph or less if possible this will run the EGR monitor after about 3 to five miles of this proceed to the highway or freeway and travel over 50 but under 70 mph for about 3 to 5 miles this will run the catalyst test provided the O2 monitors passed if they didnt you will have a check engine light on before this point also i do a coast down on exit ramps (no braking) they make great places to get that EGR to run ONCE YOU START THIS PROCEDURE DO NOT KILL THE ENGINE OR SOME OF THE TEST WILL FAIL TO RUN

Jan 04, 2013 | 1999 Lexus ES 300

1 Answer

Evap code for 1996 Nissan pickup


All you have been doing is clearing the check light on dash &
clearing the obd codes,not diagnosing anything related to
the codes or trying to solve the problem

The Evap Monitor will run when ever it should, based on how
that is programmed into the vehicles computer,no need to drive
80 miles or any miles

You should have a codes for the Evap Problem, if you stop clearing them & that also has nothing to do with an EGR Issue

Oct 17, 2012 | 1996 Nissan Pickup

2 Answers

My code reader says p1401 ford exscape


p 1401 is a code for differential pressure feedback egr circuit high input there is a small square sensor on the engine with a vacuum line here is some info Exhaust Gas Recirculation (EGR) System Monitor” Differential Pressure Feedback EGR
The Differential Pressure Feedback EGR System Monitor is an on-board strategy designed to test the integrity and flow characteristics of the EGR system. The monitor is activated during EGR system operation and after certain base engine conditions are satisfied. Input from the ECT, IAT, TP and CKP sensors is required to activate the EGR System Monitor. Once activated, the EGR System Monitor will perform each of the tests described below during the engine modes and conditions indicated. Some of the EGR System Monitor tests are also performed during on demand self-test.

The Differential Pressure Feedback EGR sensor and circuit are continuously tested for opens and shorts. The monitor looks for the Differential Pressure Feedback EGR circuit voltage to exceed the maximum or minimum allowable limits.

The DTCs associated with this test are DTCs P1400 and P1401.
The EGR Vacuum Regulator solenoid is continuously tested for opens and shorts. The monitor looks for an EGR Vacuum Regulator circuit voltage that is inconsistent with the EGR Vacuum Regulator circuit commanded output state.

Jul 26, 2010 | 2001 Ford Escape

1 Answer

Evap Sys Monitor


if evap is the only monitor that hasn't set yet, the car should still pass, a car is allowed to have 1 monitor that isn't set and still pass as long as the check engine light isn't on. take it in for the emissions, it should pass.

Jul 04, 2009 | 1997 Chevrolet Malibu

1 Answer

Failed Emissions test. OBD II not ready. Code for Low EGR Flow. Found EGR port clogged in intake plenum. Removed plenum and cleaned port, replaced all gaskets, check egr valve with vaccum(OK),...


Rich:

The trick to setting all the monitors is:
Make sure you have more than 1/4 tank of fuel but no more than 3/4.
Clear codes then Do Not cycle key off. Start vehicle and drive,make sure you do at least 2 minutes of steady spead between 40-50 mph and at least 2 minutes at 50-65 mph, usually about a 20 to 25 mile drive will set them..
If you turn the ignition off before the monitors complete then EVAP will have to see a 6 hour cold soak before it will attempt to run again.

Mar 24, 2009 | Mercury Sable Cars & Trucks

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