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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  • 84 Answers

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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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?


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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.

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

I think you will find this by MAYBE even just looking
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Is that data from your mechanics scanner ?
What is their theory ?

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

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