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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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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You need a professional scan tool & road test, to
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Have to do that before you go to inspection, every time

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You said nothing was done

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You can not just drive a vehicle & not
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There is no reset & you do not remove a battery cable

If you remove power,you just clear all memory & info,
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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

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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?
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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 ,
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I'am going to really guess here

The EVAP has leaks,but no codes set,
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The Converter is sort of out there as
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I would smoke the EVAP System and everything else,
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I think you will find this by MAYBE even just looking
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Is that data from your mechanics scanner ?
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Bank 1 has a vacuum leak I think !! ??

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