Ed,

It is indeed "Solely" a function of mileage.  It has its own mileage
counter in the black box under the van and has nothing to do with your
vehicle's odometer.  There is a speedometer cable that goes from the
driver's side front wheel to the black box and another cable goes from
the black box to the speedometer head.  The switch for turning on the
OXY light is within the black box.  Old Vanagons turn on the light after
30,000 miles.  Newer ones after 60,000 miles and the "Newest" ones don't
even have an OXY light.

Mike

Ed wrote:
> This morning the oxygen sensor light came on on my 84 vanagaon auto.
>   I have read that this a mileage related item, however the speedometer/odometer in my van hasnt worked since I have owned it. Is mileage the only thing that will trigger this? I feel that in the last tank or so of gas my mileage has probably decreased (just guessing, have no odometer!)
>
>   I will probably go ahead and replace it anyway as I have no idea when it was last done.
>
>   thanks,
>    Ed Maikranz
>   Abilene TX
>   84 Vanagon Wolfsburg.
>
>
>
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