Question about 1998 GMC Jimmy

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Emission test failed

What or how many miles need to drive for the readiness test to pass for the emission test

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  • grier_david Jun 01, 2010

    very much so it was helpful inspector said something about driving so many miles

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All you need to do is get the engine up to normal temperatures, and a couple of miles should do it.

If you are failing, then check for a bad plug or plug wire, check the air mass sensor, temperature, and O2 sensor with ohmmeter. Bad ones usually go infinite or 0 ohms.

Air mass sensor can be clogged with foam from PVC, that can easily be cleaned.

To pass, you can put a variable potentiometer in series or parallel with O2 sensor, in order to force a pass. But don't run that way continually. Check resistence of O2 sensor when engine cold and hot. This will tell whether O2 sensor increases or decreases resistance with lack of O2 (rich mixture, like when cold). Then tweak resistance accordingly.

Posted on Jun 01, 2010

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Well your emission test depends on the amount of carbon your car is letting out,, basically a catalysist convertor is whats helps your pass this,, in my country it 500 minles..

Posted on Jun 01, 2010

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1 Answer

I replaced battery but now it won't pass emission test because the "Drive Cycle" wasn't reading. What do I need to do to "read"?


Your vehicle needs to relearn itself, and run tests on the emissions equipment.

Your car is a rolling smog machine. The law requires that the computer test ALL of the emissions parts regularly.
Items such as engine sensors and misfire counters can easily be checked by virtue of the engine running. But SOME components aren't computer components. So to test them the car must be driven for a period of time, in a certain manner so that the computer can test them (fuel cap, catalytic converter, EGR valve, etc.).

When you disconnect the battery, the computer loses the results of the last test (pass or fail) and registers a "not ready" status during the test.

Most of the techs can manage to clear nearly all of the MONITORS in less than 10 miles or so. To see how this is done, do a "Google" for OBD II DRIVE CYCLE, and read the procedure.
If you are unfamiliar with this protocol, simply drive your car for 50-100 miles or so, but not all at one time. It needs some cold starts, some warm-up time, some stop and go and some easy freeway cruising. Then take it back for re-test.

Oct 17, 2015 | Chrysler Pacifica Cars & Trucks

1 Answer

Hi , I just bought a 2004 Xterra w no plates. I cant register it without an emissions test.One garage did the test and it failed.


you probably can find a tech to do this for you but keep in mind that you will be paying for however long it takes for all the drive cycles to run.

Mar 14, 2015 | 2004 Nissan XTerra

2 Answers

Why won't my car pass emissions test even if the check engine light isn't on??


the computer meters fuel based on a signal from the coolant temperature sensor. The check engine light sometimes does not come on when the sensor fails.If the sensor is causing your problem you will have a strong odor of gasoline when the car starts,It will be slow to start the first time, turn it off and it will start right up. lol

Sep 12, 2014 | Pontiac Grand Prix Cars & Trucks

1 Answer

How many miles do i need to drive before my buick lesabre reset itself


Unfortunately it is not a certain amount of time or miles that the car needs to be driven.

There are several 'readiness monitors' that basically cover each emissions related system. For instance there is an EVAP monitor that checks the EVAP system and all of it's components under certain specific conditions (No VSS, TPS, O2 sensor, IAT, MAP, Fuel trim, Injector ciruit, EGR pintle position, ECT, or MAF sensor DTC codes set; Start up engine temp 40F-86F; gas tank between 15% and 85% full, Barometer above 75 kPa, system voltage 8V-16V).

So more information is needed as to what failed you the first time. What DTC code was triggered?

If the problem has been fixed right, the history codes will go away after 40 CONSECUTIVE drive cycles WITHOUT the problem re-occurring.

Good Luck.

Jun 25, 2014 | 2000 Buick LeSabre

1 Answer

Have 2003 Kia Sorento EX, sat for couple months, then changed batter to pass emission test. Test said not ready due to computer needs to be reset, how far do I have to drive to reset computer?


I think you mean drive cycle not complete.
Generally the van needs to be driven 50-100 miles at both city and highway speeds. The distance needs to start when the engine is at operating temp, and the speed needs to vary including stop and go city. It does not have to be all in one trip but the engine must be warmed up first.

Feb 15, 2014 | 2003 Kia Sorento

1 Answer

I bought a 99 Voyager this week and it failed emmissions because the battery had been removed for a peroid of time and they said I needed to drive it for a while and bring it back. How many miles do I need...


What does "not ready" mean?

A service technician will turn off the dashboard "check engine" light after most repairs. This resets the vehicle's emission system components to "not ready". The status remains "not ready" until the vehicle's computer has had adequate time to review the repaired component. This happens after the vehicle is driven for a period of time established by the manufacturer.

If the vehicle's emissions system status is "not ready" when it is presented at the E-Check station during the initial test cycle, a tailpipe emissions test may be conducted. If the vehicle is transferred to another test type, the vehicle must remain on the different test track until the vehicle passes the emissions test or receives a waiver. For example, if the vehicle undergoes an OBD II test and fails, it cannot be downgraded to a tailpipe test on a re-test; the vehicle must pass the OBD II test.

For initial and subsequent tests, if a dashboard light is on when the vehicle is presented at the E-Check station, the vehicle will fail the test.


How can the vehicle status be made ready?

When a vehicle is driven through its normal drive cycle, the computer reviews the emission control
system and if the vehicle was properly repaired, the system resets itself to ready. A normal drive
cycle includes operation at both cruising speeds and in stop-and-go traffic for up to a couple
weeks. This process should be followed before bringing the vehicle in to be tested.

May 25, 2011 | 1999 Plymouth Voyager

1 Answer

I can not get my 97 saturn SL1 to pass emission i have changed an oxygen sensor and cleared codes the emissions place tell me to drive it because the monitors are not ready for the oxygen sensor and...


When all the monitors have run their tests then it will pass emmissions providing that your repairs were successfull...You need to drive it for at least 75 miles so that it can complete its tests....

Feb 13, 2010 | 1991 Saturn SL1

2 Answers

My 2002 Grand Prix GT 3.8L Won't pass emissions. Testing center's scanner says car was recently worked on and that the mileage driven since is not enough to recycle check engine light. The ck eng. light...


Nope, you just need more miles. When the car's computer has been disconnected from power (such as when the battery is unhooked), it'll set what are called "readiness codes" when power is reapplied. It takes a certain number of miles to clear these - some cars require 50 miles, some 100 miles, and some (such as some Isuzu models) need very specific drive cycles to clear them. Once the requisite number of miles have been driven without issues, the readiness codes will extinguish and your car should pass.

Dec 10, 2009 | 2002 Pontiac Grand Prix

1 Answer

Failed TN emissions testing. 1996 Mazda


the computer needs to be reset by performing a code erase then drive 500 miles

Sep 23, 2009 | 1996 Mazda Protege

2 Answers

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.

Mar 18, 2009 | 2003 Mercedes-Benz CLK-Class

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