Question about 2000 Saturn SW2

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I tried to get a sticker and failed because it stated that 2 (02)sensors, catalyst and evap were not ready on my 2001 saturn sw2. How do I fix this? I have been over 300 miles and have failed twice.w

Scan data stats these 4 things were not ready. Catalyst, Evap, 02 Sensor, 02 Sensor heater

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  • Saturn Master
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It is not something you fix, the system self tests after any time the battery is disconnected or the system reset with a scanner tool. Drive it until it clears, take about 20 miles of mixed driving, idle time, freeway, moderate speeds like in town. Gas tank must be at least 3/4 full for the test to complete. This is known as an OBD2 drive cycle. If you had a check engine light and it comes on again then you did not fix the problem.

Posted on Mar 28, 2014

  • yadayada
    yadayada Mar 30, 2014

    Here is a step by step OBD2 drive cycle test. Follow it exactly to clear the "not ready" problem. Just google this "GM OBD2 Drive Cycle Test"


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Take you car over to auto zone or one of the part stores that do the free computerI tried to get a sticker and failed because it sta - icon1.png test. They will do it for free and sell the part to you for way less money.
This is incorrect, the hand held will only show a code for a O2, but there are 2 or 4 of them, you need to replace all of them..Its best, instead of playing the guessing game.

Posted on Mar 30, 2014

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  • yadayada
    yadayada Mar 30, 2014

    Never accept the advice of what part to replace based on the advice of a parts counter person, period.

  • yadayada
    yadayada Mar 30, 2014

    In my state it is illegal to do so.

  • Dene Lass Apr 13, 2014

    If the scan shows an O2 code, whats illegal about that, never heard of any State that does not allow a comp scan and show a code, that would be plan as day what if any replacement part, to fix the problem..I call BS on that.



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Posted on Jan 02, 2017

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SOURCE: check eng light with code po431 replased ox/sensors

P0431 is Warm Up Catalyst Efficiency Below Threshold (Bank 2). What is happening is this....the O2 sensor downstream of the Catalytic Converter is detecting the Converter is not working as efficiently as it should be (according to your cars specifications). 3 main causes of this is 1.) Defective O2 Sensor (which in your case elminates this one) 2.) Catalytic Converter is no longer functioning properly. or 3.) There is an exhaust leak. You will not notice any driveablitiy problems, however, you may get a rough/hard idle when its cold out. I would take your car to an exhaust shop and have them do a free exhaust system inspection. Alot of places like Midas/Mieneke Car Center/Monroe Muffler to name a few do these checks for free. Thanks for Using FixYa!



Posted on Dec 06, 2008

  • 319 Answers

SOURCE: Emissions Failure-Multiple Codes

take you car over to auto zone or one of the part stores that do the free computer test. They will do it for free and sell the part to you for way less money.

Posted on Mar 16, 2009

  • 186 Answers

SOURCE: My 1999 Saturn Sl, 4 cylinder, 4DR, 5 speed failed emissions inspection- Code P1404- catalyst heater monitor. What is this, what does it do, and how much to repair-estimate?

P1404 Is an EGR Code,Needs New EGR Valve & Check the vacuum port for excessive carbon or restrictions

Posted on May 09, 2009

  • 12 Answers

SOURCE: My 1993 Saturn SL2 just failed the Smog Check

change your O2 sensor.

Posted on Jul 23, 2009

  • 468 Answers

SOURCE: My saturn wont pass emissions test and we have changed the evap

Ok, first you need to check the car to see if it's actually not heating up, or the sender's just messed up. If the car is actually heating up, replace the temperature sender, and it will likely solve your emissions problem at the same time. The sensor does double-duty, and if it's not registering the car as being warm, it will not allow the car to read the input from the oxygen sensors(it doesn't allow it to go into "closed loop" mode). If it actually isn't warming up, then replace your thermostat; it's likely stuck open, causing it to cool too well, and not going into closed loop because of it.

Posted on Jan 24, 2010

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My 2001 x5 evap & catalyst report not ready, I reset my MAF OBDII Code ~70 miles before checking it, but...

if you had reset the code[ or had a dead battery]you just cleared and reset all the vehicles evap / emissions systems it now has to recycle through to reset you wont have a check engine or mil unless computer finds a fault and on most vehicles it can be about 125 miles and usually the last to reset are the evap and the catalytic converter drive around and at around 125 mark go to an auto store and have vehicle scanned most offer this service for free or if you have one check your system for ready if not keep driving some more most states give you 10 days to retry so use that time to rack up miles -- and dont reset or clear codes before an inspection

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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.

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It also says that the EGR is not ready

You must complete what is called an OBD2 drive cycle test, be patient.

Mar 28, 2014 | 2000 Saturn SW2

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broken evap line/port on fuel pump. Or leaking fuel pump o-ring
check the EVAP canister it is right next to fuel filter could be pcm needs update to fix false codes. Here is a old hillbilly trick that may help put saliva on the seal of gas cap when you fill up every time that may work for you.

Mar 26, 2014 | 2002 Oldsmobile Alero

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Evap system and catalyst not passing for inspection

Evap could be numerous things need to smoke test it, catalyst effiency code? could be a leaky exhausts or need to to a pin point test for best results

Mar 07, 2013 | Cars & Trucks

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Ford explorer sportrac evap and catalyst not ready problem how to fix it?

One possible issue is a faulty thermostat. If the engine is not getting up to normal temp the emissions system will not go into closed loop.
I know its hot in Nevada now so thats just a suggestion.
The O2 sensors have heaters to make the exhaust gas hot quick so that the sensors can work.
Is the check engine light coming on - or is it just that the exhaust gas is not hot enough for the test equipment ?

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My 2000 Saturn did not pass inspection due to evap. and O2 sensors "Not Ready". How can I fix the problem or how can the problem be fixed?

What is the EVAP code?

The O2 are not ready because it takes some time for them to complete there self check after clearing trouble codes. This will involve a few drive cycles. Once the evap problem has been resoled, the check engine light cleared, you'll have to drive it for a couple of days to get everything in the "ready" status.

I’m happy to assist further over the phone at

Sep 27, 2010 | 2000 Saturn SL

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Failed emmisions test..

I am in Virginia but I believe you vehicle is showing a monitors not ready for Catalyst & Evap. If that is correct you need to basically drive the car a few days. The computer will remonitor itself and should be fine following that. Most drive cycles require highway driving & city driving. Make sure you turn on a/c as well. Its not how many miles you drive but what conditions you drive that sets you monitors. You could locate the drive cycle and attempt to replicate it but its usually very difficult drive exactly as the cycle asks. Good luck.

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Obd not ready won't pass inspection

It usually takes more than one drive cycle to clear all monitors to "ready".The vehicle may take multiple "from cold" drive cycles and hundreds of miles to clear all.Drive normally with varied driving and include long coasting down stops.Buy a cheap scan tool ($35) and check monitors as you drive.
DO NOT CLEAR CODES or run the battery dead or you will have to start over!

May 29, 2017 | 2001 Pontiac Grand Am SE

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Monitors not ready: Catalyst,Evap System, Oxygen Sensor, Egr Syst

Drive it some more. Has the battery been disconnected/replaced recently? The Inspection station should be able to print you out a drive cycle to get the monitors ready also.

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