Question about 1996 Volkswagen Jetta

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Emission /02 sensor diagnostic system not ready for testing

I have just change my 02 sensor/ I clear the gig off/ today. I went to get emission test they said diagnostic system not ready for testing. My question is do I have to drive so many miles before it resets?

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  • Jerry Koski
    Jerry Koski May 11, 2010

    did you disconnect the battery for a few and then reconnect it ? thanks Jerry

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Hello, Sometimes you have to drive 20, 30 minutes or more before the computer loses the code and resets unless you still have a problem
I hope this was helpful.
CYA, Gator241

Posted on Feb 07, 2009

  • Wally Wicker Feb 09, 2009

    Hello again, If you find this information to be correct would you please enter a "fixya" rating.

    Thanks, Gator241

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1 Answer

Replaced battery and BCM (reprogramed by dealer)and cleared ECM trouble codes. OBD wont acheive readiness for emissions testing even after 600+ miles. Can anything be done to complete readiness?


there is still a problem with
motor itself
the 02 sensors
the catalytic converter or the
engine emissions /gas .. filtering /re burn system

Jan 13, 2016 | Cars & Trucks

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03 focus engines sensors not ready for emission test but not reset manually or battery disconnect


You need a professional scan tool & road test, to
gather data, to find out why some of the 8 Emission
Monitors won't run

Have to do that before you go to inspection, every time

If you fail to check I/M or look at data or do Preventative
Maintenance, your going to fail, possibly

You said nothing was done

That is your answer

You can not just drive a vehicle & not
work on it, several times a year, or know
what the data looks like, or if codes are in
the systems

There is no reset & you do not remove a battery cable

If you remove power,you just clear all memory & info,
you need to diagnose the vehicle & then the Monitors
have to run again

You could loose a few days before they run again by
doing that

If monitors do not run clear, then your statement about
no running issues, is not true & you could be ruining
your exhaust converter

Oct 30, 2014 | Ford Focus Cars & Trucks

1 Answer

Ok let me start by saying that my 2006 Nissan Altima 2.5 S had a check engine light....it was checked and it came up P0037 bank 1 sensor 2.....and I was told that it was the down stream sensor...I...


You need to find a new shop that can actually diagnose
a vehicles evap system & the emission monitors

You can not do that without professional tools & knowledge

Don't know how many times you need to be told that

The shop you went to isn't doing anything apparently

You have problems to find & resolve & no one else will
give you a different answer, if they even work on vehicles,
or have knowledge of the obd systems & only the pros have
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Apr 30, 2014 | Cars & Trucks

2 Answers

Obd computer won't reset


you can force the engine light to come on with ready or not software (type it in on google) i have this gear. your ecu has to reconise all emmissions sensors data on a 3times in a row before it will complete a full diagnostics cycle.
the ready or not scanner and software will atomatically do everything for you and tell you when everything is ready (so much easier than messing about guessing all the time).
you can also program scanner to your state regulations aswell.think it's about $50 now

hope this helps.

regards, danny

Oct 01, 2012 | 2003 Dodge Caravan

1 Answer

Emmissions test can't be finished because the computer needs to be reset after a new battery cable


That should be enough time to reset the emission systems. Did you clear codes since then or remove the battery or one its cables for another reason?
Check to make sure all the battery cables are tight and clean. Sometimes if a cable doesn't have a good connection to the battery due to being loose or dirty, it may not allow the battery to keep the car's memory when it's shut off so may reset the emissions.

Sep 20, 2012 | 2001 Oldsmobile Silhouette

1 Answer

Check Engine light issues


change the evap sensor the location of the sensor should be on a sticker schematic under your hood

Aug 27, 2012 | Cars & Trucks

1 Answer

I have an 04 cavalier. Code P0172 mechanic changed upstream 02 senor. light came back on. Brought back to mechanic he changed the downstream, light came back on. I changed fuel filter, spark plugs, oil...


Think your guy changed O2 Sensors ,
but didn't consider that your sensors PO172
is rich,because it is correcting for a lean condition


I'am going to really guess here

The EVAP has leaks,but no codes set,
partially driving the system lean (Vacuum Leaks)

The Converter is sort of out there as
not working well either

I would smoke the EVAP System and everything else,
intake manifold etc

I think you will find this by MAYBE even just looking
for a bad hose leak

Is that data from your mechanics scanner ?
What is their theory ?

Bank 1 has a vacuum leak I think !! ??

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2 Answers

Po 440 code check engen


p0440 is an evaporitive emission system system large leak detected generally on an 02 gm vehicle it is very common that the vent solenoid located by the fuel tank if you replace it the light will take a few days to clear its self. the vehicle runs tests on all sensors and systems and the test has to pass or fail a number of times before the pcm will turn on or turn off a check engine light.

Dec 20, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Been for inspection now 6 times and it isn't ready due to 02 sensors and evap system not ready. Kia fixed "something" and told me to drive the vehicle for a couple of days and it would inspect. NOPE! What...


make sure to clear the code,and have the car at operating temp when you take it to get inspection,if you still have that problem tell the emissions inspector and see if they can override that on your test.








TIM........

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1 Answer

Emissions egr came up on the computer test i replace it now oxygen sensor are coming up its has 4


a defective EGR valve will at time effect 02 sensor functions. But even though you vehicle does have 4 02 sensor. The DTC (diagnostic trouble code) will indicate which 02 sensor is faulty. ask the tech who performed the test on your vehicle to tell you which sensor has malfunctioned. or get the dtc code from him then google the dtc for your vehicle and you will have the answer to your question

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