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Readiness codes wont reset

Cat and evap. Havent reset

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SOURCE: wont complete scan to pass emission test

When you rest your codes there is a series of tests your ECU has to go through before you can pass emissions. this is done some people can reset the code and go before its sets the code again. on the 96 you can have 2 tests not complete for it to pass. basicly you have to drive the car a couple days for the tests to pass.

check the readiness tests wait until only 2 have not passed. then you should be good.so drive and check.

Michael
ASE certified
PLZ rate.

Posted on Feb 09, 2009

  • 82 Answers

SOURCE: Resetting CAT & EVAP Monitors

take the pos cable off battery, wait 45 sec and reconnect

Posted on Feb 26, 2009

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Do you have an EVAP Code?

Posted on Jul 25, 2011

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2 Answers

Why do i get OBD/READINESS, Not ready?


Alan, I f you have had battery disconnected or had some one erase codes recently, the computer has to go through what is known as a drive cycle to complete all monitors cycling, some vehicles complete cycle in 10 miles, where as some could take 100 miles or more.
My Toyota EVAP readiness state will not cycle in cold weather and takes thousands of miles before it gets to readiness state.
I think some shops can force systems to run if they have a good scan tool.

Mar 06, 2016 | Cars & Trucks

1 Answer

Readiness monitors wont reset


You have 8 I/M or Emission Monitors
3 continuous
5 that have to run

They should run clear after 10 or 15 miles of driving
IF,ALL problems have been resolved

The Evap Monitor will only run every few days

Any person or repair shop HAS TO Road Test with scan tool
until the monitors run,except evap,BEFORE,BEFORE,Your given
the car back

It is NOT,NOT your job to run monitors or drive cycles

You would have no idea what they are, or how to perform
them,some shops don't ,as they have no data base or care
to look up that info

Bottom Line

Your car was not properly diagnosed or repaired (YET)

No Codes on a code reader, is not the same as using professional
tools & enhanced data & other data, to find a problem

Don't need codes present to see or find things that are not right

May 10, 2014 | 2004 Pontiac Grand Prix

1 Answer

I can't get an inspection sticker for my car because it keeps failing inspection because the computer will not reset. Every time it does the same thing. When they test the OBDII Readiness it says the...


Every time you reset the light or disconnect the battery it completely resets the system and it has to go through EVERY test again. The O2, EVAP, and Cat tests are generally the LAST THREE tests that are tested. You're not doing yourself any favors here.

Essentially what these readiness monitors are is the computer's notation that his has run the self diagnostics on each system and that the results feel into the expected results. If it is outside the expected results the computer will generally try to run the test multiple times before setting a DTC and turning on the Check Engine Light. It cannot set the status to "Ready" until it has a successful test within expected results; sometimes multiple successful tests. Sometimes, the tests need to run at different speeds - so the vehicle has to be driven not only at freeway speeds, but also city speeds for the tests to complete properly.

The O2 test MUST complete before the Catalyst test can run. The EVAP test generally requires that you have your fuel level at between 1/4 and 3/4 and that the vehicle sit undisturbed after being driven for a period of time for no less than 8 hours in order to run the EVAP test.

The same can be said for the O2 test sometimes because the computer needs to test the O2 sensors reaction to heating up and cooling down. Eventually they will all complete - unless there is an issue. I have seen where a component was in the process of going out and the computer was getting both GOOD and BAD results when running the tests. As a result it wouldn't set ready status because it wasn't getting the concurrent GOOD test results.

As a Texas Recognized Emissions Repair Facility - my shop sees this kind of stuff all the time.

Good Luck.

Jun 01, 2011 | 2006 Mazda 6

1 Answer

Need to turn off check engine light


You can get a obd2 scanner at an auto parts store (they might let you barrow one for free) and click erase codes or unscrew the power (red) wire off the battery for 30 sec. If youre trying to pass a emissions test you'll have to still drive the car a couple dozen miles to set the readiness test (evap, cat, o2, etc) before they will pass your car.

May 03, 2011 | Mercury Villager Cars & Trucks

1 Answer

I have a 2002 mercury cougar that wont pass pa emissions test. when i check the readiness staus it shows the evap system still hasnt completed its tests. theres no dtc's and i drove it all over trying to...


could be ur o2 sensors or clogged catalytic converter these have a lot to do with emmission sometimes its a bad gas cap number one problem evap get a new one and check code again the cap has a seal that if it leaks gives you evap code

Feb 20, 2010 | 2002 Mercury Cougar

1 Answer

Service engine light on,needed 02sensor,replaced reset light off,drove 100 miles ,went for inspection says catalyst and evaporation sytem not reset


you may have a cat thats on its was out. also whats the fuel system at ? if you have 1/4 tank or full tank it will not test the evap system and there for wont set the monitor. or you just havent met the right condtions

Sep 05, 2009 | 2001 Oldsmobile Silhouette

1 Answer

I have a problem with my 2001 Toyota sienna, took it to inspection yesterday to get inspected and didn't pass results Cat not ready and evap not ready, inspector tell us run the car couple miles and bring...


If the "evap not ready" readiness monitor never clears and you keep getting P0440,P0441,P0446 type codes, then you have a problem with the evap system. You have already tried the gas cap (good start) but there are about 6 other things it can be from electrical VSV air valves (there are 3 of them, 2 under the hood, 1 near the charcoal cannister (behind fuel tank) to 2 air operated valves on the front of the same cannister. There is also an air line that goes to one of the electric VSV valves on the air cleaner under the hood. Several oil change places have been guilty of pullling these off and not reconnecting them.
We have a page with pictures of our experience,

http://www.findonefindall.com/toyota-sienna/toyota_sienna_evap_P0446.htm

Apr 21, 2009 | 2001 Toyota Sienna

1 Answer

Wont complete scan to pass emission test


When you rest your codes there is a series of tests your ECU has to go through before you can pass emissions. this is done some people can reset the code and go before its sets the code again. on the 96 you can have 2 tests not complete for it to pass. basicly you have to drive the car a couple days for the tests to pass.

check the readiness tests wait until only 2 have not passed. then you should be good.so drive and check.

Michael
ASE certified
PLZ rate.

Feb 09, 2009 | 1996 Chevrolet Blazer

1 Answer

Resetting CAT & EVAP Monitors


take the pos cable off battery, wait 45 sec and reconnect

Dec 16, 2008 | 1999 Volvo S70

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