I have one in my 87 Syncro Westy. The OXS LED makes a great "Check
Engine" light for the Subie conversions here in CA. The ref I saw
insisted that this was a "must have". Has to be labeled as such as well.

Jeff in Marin

On Mar 13, 2012, at 9:00 PM, Automatic digest processor wrote:

> Date:    Tue, 13 Mar 2012 23:35:09 -0400
> From:    David Beierl <dbeierl@ATTGLOBAL.NET>
> Subject: Re: Using the "extra" LEDs in the instrument cluster
>
> At 04:06 PM 3/13/2012, Dave Mcneely wrote:
>> Can someone tell me more about these LEDs.  I am not familiar with
>> any unused LEDs in the instrument cluster, nor do I know the oxygen
>> sensor LED.  Where are these lights?
>
> Look above/below the warning lights in between the gauges and you'll
> see some dummy positions.  They have bumps that are shaped like the
> LEDs but are just black plastic.
>
> You haven't got an OXS light since by the time your '91 was made VW
> were no longer specifying a service interval for the sensor and had
> removed the light and associated expensive switch gear.  My '89
> doesn't have one either, not sure whether they took it out in '87 or
> '88 and too lazy to look at the diagrams in Bentley.  Also too lazy
> to go see if they took it out of the owner's manual - in '89 they
> were still specifying the same incorrect taillights they were in '84,
> so it wouldn't totally surprise me if they hadn't.
>
> Yours,
> David