On my 1.9 engines, if I disconnect a working O2 sensor, the only
noticeable difference is lower gas mileage.  It goes from about 21 mpg
to about 17 mpg.

When I've had a bad sensor, my symptom has has always been "Really poor"
gas mileage and stumbling at highway speed.

You know what they say, though.  YMMV

Mike

TJ Hemrick wrote:
> My archive search hangs even on a single word search so I have to ask.
> Shouldn't I notice a detectable difference with the O2 sensor disconnected
> at idle or driving?
>
> TJ
>