'95 A6 - Catalytic converter

[Mark R]

I'm surprised.  By definition, the rear o2 sensor is there to verify the
function of the cat.  The fronts tune (closed loop) the engine, the rears
verify the emissions.

Mark Rosenkrantz

On Thu, Feb 28, 2008 at 2:07 PM, Tihol Tiholov <t.tiholov at gmail.com> wrote:

> > I think your car has pre-cat and post-cat oxygen sensors.
> > Without a simulator, the check engine light would still be on and your
> fuel economy would suffer.
>
> Likely true for many/most cars.  However, my BTDT  - a '99 VAG (2.0 AEG
> VW)
> @ 280+K km is on the 3rd front OXS, original rear OXS, happy CEL ... kity
> ... hmmmm ... empty (intended to be a race car, honest!).
> Of coarse, both kitties should be treated equally.
> And to Fay: Nice to listen to your husband, some times, says so in the
> bible, too ;o)