> As a
> different side effect, if one cylinder is misfiring or there's an
> exhaust leak upstream of the sensor it will drive the mixture way
> rich trying to get rid of the excess oxygen.

Yeah, that's exactly what my work van does. You can see it on the
little O2 meter I hooked up, misfiring every second or two, slamming
that needle down to zero, confusing the ECU and driving the whole
thing rich. Passes smog and gets 15MPG carrying 800 pounds of tools
and parts with an auto transmission, though, so it's not a show
stopper. I keep meaning to chase that down, but who has time
anymore....

--
John Bange
'90 Vanagon - "Lastwagen"
'90 Vanagon GL - "Wiesel"